skylark_repository_test: use label in all load statement 
skylark_repository_test: use label in all load statement 

This test was still using the old path syntax that is deprecated,
use the label syntax instead.

Note that there is still several instance of that old syntax
in our tests:

```
grep -E -r  'load\(['"'"'"]/[^/]' src/test | wc -l
     109
```

--
Change-Id: Id2d1a9a525f1584136501026de01cf53e2263c3f
Reviewed-on: https://cr.bazel.build/8135
PiperOrigin-RevId: 143967775
MOS_MIGRATED_REVID=143967775

werkt/bazel,aehlig/bazel,Asana/bazel,dropbox/bazel,davidzchen/bazel,juhalindfors/bazel-patches,kchodorow/bazel-1,hermione521/bazel,dslomov/bazel,kchodorow/bazel,hermione521/bazel,safarmer/bazel,hermione521/bazel,davidzchen/bazel,cushon/bazel,variac/bazel,snnn/bazel,safarmer/bazel,kchodorow/bazel-1,dslomov/bazel,snnn/bazel,aehlig/bazel,meteorcloudy/bazel,variac/bazel,juhalindfors/bazel-patches,perezd/bazel,Asana/bazel,variac/bazel,damienmg/bazel,hermione521/bazel,ulfjack/bazel,cushon/bazel,dslomov/bazel-windows,damienmg/bazel,meteorcloudy/bazel,juhalindfors/bazel-patches,dslomov/bazel-windows,aehlig/bazel,Asana/bazel,dslomov/bazel,variac/bazel,ulfjack/bazel,dslomov/bazel,safarmer/bazel,twitter-forks/bazel,werkt/bazel,bazelbuild/bazel,juhalindfors/bazel-patches,spxtr/bazel,akira-baruah/bazel,safarmer/bazel,ButterflyNetwork/bazel,dslomov/bazel-windows,kchodorow/bazel,twitter-forks/bazel,katre/bazel,davidzchen/bazel,dslomov/bazel-windows,cushon/bazel,meteorcloudy/bazel,werkt/bazel,ulfjack/bazel,perezd/bazel,ulfjack/bazel,juhalindfors/bazel-patches,bazelbuild/bazel,kchodorow/bazel,aehlig/bazel,katre/bazel,hermione521/bazel,Asana/bazel,damienmg/bazel,kchodorow/bazel,dropbox/bazel,LuminateWireless/bazel,meteorcloudy/bazel,LuminateWireless/bazel,davidzchen/bazel,spxtr/bazel,cushon/bazel,LuminateWireless/bazel,Asana/bazel,spxtr/bazel,spxtr/bazel,dslomov/bazel,katre/bazel,dropbox/bazel,damienmg/bazel,dropbox/bazel,meteorcloudy/bazel,twitter-forks/bazel,perezd/bazel,werkt/bazel,twitter-forks/bazel,perezd/bazel,kchodorow/bazel-1,variac/bazel,twitter-forks/bazel,juhalindfors/bazel-patches,akira-baruah/bazel,bazelbuild/bazel,werkt/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,aehlig/bazel,kchodorow/bazel-1,damienmg/bazel,LuminateWireless/bazel,safarmer/bazel,cushon/bazel,variac/bazel,spxtr/bazel,ulfjack/bazel,ulfjack/bazel,davidzchen/bazel,twitter-forks/bazel,twitter-forks/bazel,juhalindfors/bazel-patches,aehlig/bazel,dropbox/bazel,akira-baruah/bazel,dslomov/bazel-windows,akira-baruah/bazel,perezd/bazel,LuminateWireless/bazel,dslomov/bazel,kchodorow/bazel,damienmg/bazel,snnn/bazel,katre/bazel,Asana/bazel,davidzchen/bazel,cushon/bazel,damienmg/bazel,kchodorow/bazel-1,LuminateWireless/bazel,kchodorow/bazel-1,kchodorow/bazel,ulfjack/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,hermione521/bazel,dslomov/bazel-windows,meteorcloudy/bazel,spxtr/bazel,meteorcloudy/bazel,snnn/bazel,Asana/bazel,ButterflyNetwork/bazel,snnn/bazel,aehlig/bazel,davidzchen/bazel,snnn/bazel,ButterflyNetwork/bazel,katre/bazel,katre/bazel,dslomov/bazel,perezd/bazel,perezd/bazel,ButterflyNetwork/bazel,variac/bazel,akira-baruah/bazel,akira-baruah/bazel,kchodorow/bazel,werkt/bazel,snnn/bazel,spxtr/bazel,bazelbuild/bazel,dropbox/bazel,safarmer/bazel