Stop creating an extra target graph in `buck targets --show-target-hash`
Stop creating an extra target graph in `buck targets --show-target-hash`

Summary:
Probably through a series of refactorings, we've managed to create
an extra copy of the target graph.  This change removes this madness.

The use of `ProjectGraphParser` was added at some point to make it
easier to write tests for this, however those tests have not
materialized and the abstraction likely led to a series of refactors
that managed to introduce this extra copy because it was non-obvious
that the graph created from the `ProjectGraphParser` was identical to
the target graph.

Test Plan: CI

Reviewed By: bhamiltoncx

fb-gh-sync-id: 3cc6955

raviagarwal7/buck,Addepar/buck,LegNeato/buck,OkBuilds/buck,shybovycha/buck,clonetwin26/buck,shybovycha/buck,zpao/buck,darkforestzero/buck,vine/buck,grumpyjames/buck,robbertvanginkel/buck,zhan-xiong/buck,brettwooldridge/buck,JoelMarcey/buck,vschs007/buck,brettwooldridge/buck,raviagarwal7/buck,Dominator008/buck,nguyentruongtho/buck,clonetwin26/buck,illicitonion/buck,Addepar/buck,justinmuller/buck,Distrotech/buck,marcinkwiatkowski/buck,k21/buck,dsyang/buck,clonetwin26/buck,illicitonion/buck,justinmuller/buck,bocon13/buck,Addepar/buck,vschs007/buck,facebook/buck,daedric/buck,rmaz/buck,raviagarwal7/buck,Addepar/buck,kageiit/buck,OkBuilds/buck,brettwooldridge/buck,davido/buck,davido/buck,Dominator008/buck,brettwooldridge/buck,vschs007/buck,shs96c/buck,OkBuilds/buck,davido/buck,rmaz/buck,shs96c/buck,JoelMarcey/buck,Distrotech/buck,OkBuilds/buck,robbertvanginkel/buck,brettwooldridge/buck,Addepar/buck,zhan-xiong/buck,bocon13/buck,daedric/buck,JoelMarcey/buck,raviagarwal7/buck,liuyang-li/buck,rowillia/buck,liuyang-li/buck,marcinkwiatkowski/buck,daedric/buck,clonetwin26/buck,ilya-klyuchnikov/buck,LegNeato/buck,SeleniumHQ/buck,LegNeato/buck,darkforestzero/buck,raviagarwal7/buck,ilya-klyuchnikov/buck,kageiit/buck,justinmuller/buck,k21/buck,JoelMarcey/buck,mogers/buck,Dominator008/buck,Dominator008/buck,sdwilsh/buck,OkBuilds/buck,LegNeato/buck,nguyentruongtho/buck,Distrotech/buck,grumpyjames/buck,vine/buck,dsyang/buck,shybovycha/buck,Addepar/buck,daedric/buck,zpao/buck,illicitonion/buck,Dominator008/buck,k21/buck,marcinkwiatkowski/buck,justinmuller/buck,illicitonion/buck,dsyang/buck,clonetwin26/buck,janicduplessis/buck,SeleniumHQ/buck,mikekap/buck,zhan-xiong/buck,SeleniumHQ/buck,shs96c/buck,vine/buck,nguyentruongtho/buck,robbertvanginkel/buck,shs96c/buck,vschs007/buck,robbertvanginkel/buck,clonetwin26/buck,shs96c/buck,davido/buck,Addepar/buck,romanoid/buck,rowillia/buck,vine/buck,k21/buck,brettwooldridge/buck,brettwooldridge/buck,illicitonion/buck,k21/buck,OkBuilds/buck,shybovycha/buck,clonetwin26/buck,JoelMarcey/buck,zhan-xiong/buck,k21/buck,romanoid/buck,shybovycha/buck,SeleniumHQ/buck,OkBuilds/buck,dsyang/buck,Distrotech/buck,Addepar/buck,janicduplessis/buck,marcinkwiatkowski/buck,k21/buck,shybovycha/buck,dsyang/buck,ilya-klyuchnikov/buck,Distrotech/buck,mikekap/buck,romanoid/buck,Distrotech/buck,mogers/buck,grumpyjames/buck,Distrotech/buck,marcinkwiatkowski/buck,sdwilsh/buck,justinmuller/buck,clonetwin26/buck,kageiit/buck,SeleniumHQ/buck,LegNeato/buck,rmaz/buck,shybovycha/buck,rmaz/buck,raviagarwal7/buck,bocon13/buck,darkforestzero/buck,OkBuilds/buck,marcinkwiatkowski/buck,janicduplessis/buck,romanoid/buck,zhan-xiong/buck,raviagarwal7/buck,bocon13/buck,davido/buck,davido/buck,k21/buck,facebook/buck,dsyang/buck,vine/buck,mogers/buck,liuyang-li/buck,grumpyjames/buck,brettwooldridge/buck,zpao/buck,liuyang-li/buck,shybovycha/buck,OkBuilds/buck,Addepar/buck,SeleniumHQ/buck,nguyentruongtho/buck,Addepar/buck,rmaz/buck,rowillia/buck,brettwooldridge/buck,facebook/buck,mikekap/buck,romanoid/buck,illicitonion/buck,raviagarwal7/buck,LegNeato/buck,daedric/buck,ilya-klyuchnikov/buck,zpao/buck,liuyang-li/buck,zhan-xiong/buck,bocon13/buck,JoelMarcey/buck,zhan-xiong/buck,marcinkwiatkowski/buck,vine/buck,zhan-xiong/buck,robbertvanginkel/buck,Dominator008/buck,bocon13/buck,Addepar/buck,sdwilsh/buck,vine/buck,mikekap/buck,grumpyjames/buck,robbertvanginkel/buck,vschs007/buck,davido/buck,k21/buck,Dominator008/buck,liuyang-li/buck,justinmuller/buck,k21/buck,SeleniumHQ/buck,bocon13/buck,LegNeato/buck,shybovycha/buck,sdwilsh/buck,rmaz/buck,LegNeato/buck,SeleniumHQ/buck,raviagarwal7/buck,shs96c/buck,facebook/buck,k21/buck,romanoid/buck,romanoid/buck,brettwooldridge/buck,janicduplessis/buck,illicitonion/buck,davido/buck,rmaz/buck,vschs007/buck,romanoid/buck,Distrotech/buck,darkforestzero/buck,Dominator008/buck,romanoid/buck,facebook/buck,vschs007/buck,grumpyjames/buck,Distrotech/buck,robbertvanginkel/buck,vschs007/buck,sdwilsh/buck,grumpyjames/buck,mikekap/buck,LegNeato/buck,nguyentruongtho/buck,davido/buck,mikekap/buck,JoelMarcey/buck,shybovycha/buck,sdwilsh/buck,illicitonion/buck,zhan-xiong/buck,k21/buck,vschs007/buck,bocon13/buck,mogers/buck,facebook/buck,rowillia/buck,ilya-klyuchnikov/buck,LegNeato/buck,illicitonion/buck,robbertvanginkel/buck,facebook/buck,grumpyjames/buck,dsyang/buck,rmaz/buck,OkBuilds/buck,rmaz/buck,daedric/buck,raviagarwal7/buck,marcinkwiatkowski/buck,shs96c/buck,shs96c/buck,zhan-xiong/buck,daedric/buck,zpao/buck,mikekap/buck,ilya-klyuchnikov/buck,LegNeato/buck,darkforestzero/buck,vine/buck,mogers/buck,darkforestzero/buck,rowillia/buck,ilya-klyuchnikov/buck,zhan-xiong/buck,k21/buck,robbertvanginkel/buck,robbertvanginkel/buck,davido/buck,illicitonion/buck,robbertvanginkel/buck,vine/buck,janicduplessis/buck,justinmuller/buck,rowillia/buck,zhan-xiong/buck,shybovycha/buck,rowillia/buck,daedric/buck,marcinkwiatkowski/buck,rowillia/buck,liuyang-li/buck,ilya-klyuchnikov/buck,rmaz/buck,clonetwin26/buck,illicitonion/buck,mogers/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