fix(aio): preserve static Observable methods (#21351)
fix(aio): preserve static Observable methods (#21351)

PR Close #21351

Brocco/angular,mprobst/angular,StephenFluin/angular,alexeagle/angular,rkirov/angular,jasonaden/angular,kara/angular,JiaLiPassion/angular,StephenFluin/angular,ocombe/angular,dsebastien/angular,robwormald/angular,shairez/angular,snaptech/angular,chuckjaz/angular,kegluneq/angular,snaptech/angular,trshafer/angular,mhevery/angular,vikerman/angular,juristr/angular,hansl/angular,mgechev/angular,mgiambalvo/angular,JiaLiPassion/angular,Toxicable/angular,NathanWalker/angular,mzgol/angular,vsavkin/angular,wKoza/angular,alexeagle/angular,NathanWalker/angular,jasonaden/angular,heathkit/angular,heathkit/angular,robwormald/angular,vsavkin/angular,brandonroberts/angular,gkalpak/angular,IdeaBlade/angular,wKoza/angular,filipesilva/angular,mzgol/angular,alxhub/angular,rkirov/angular,mprobst/angular,hansl/angular,ghetolay/angular,jasonaden/angular,vikerman/angular,kara/angular,hansl/angular,chuckjaz/angular,jonrimmer/angular,trshafer/angular,rkirov/angular,vsavkin/angular,angular/angular,alexeagle/angular,ValtoFrameworks/Angular-2,Toxicable/angular,snaptech/angular,alxhub/angular,Toxicable/angular,mlaval/angular,Toxicable/angular,matsko/angular,Brocco/angular,robwormald/angular,alxhub/angular,mprobst/angular,LucasSloan/angular,angular/angular,gnomeontherun/angular,snaptech/angular,vsavkin/angular,vicb/angular,juristr/angular,snaptech/angular,kegluneq/angular,Brocco/angular,hansl/angular,gnomeontherun/angular,chuckjaz/angular,mzgol/angular,heathkit/angular,vikerman/angular,mgol/angular,hansl/angular,ultrasonicsoft/angular,jasonaden/angular,mhevery/angular,aboveyou00/angular,NathanWalker/angular,cironunes/angular,mgiambalvo/angular,mgol/angular,IdeaBlade/angular,NathanWalker/angular,dsebastien/angular,manekinekko/angular,snaptech/angular,IgorMinar/angular,filipesilva/angular,juristr/angular,NathanWalker/angular,chuckjaz/angular,kegluneq/angular,ocombe/angular,matsko/angular,hansl/angular,LucasSloan/angular,mgechev/angular,petebacondarwin/angular,jonrimmer/angular,ValtoFrameworks/Angular-2,juristr/angular,aboveyou00/angular,chuckjaz/angular,vsavkin/angular,mgechev/angular,mhevery/angular,kegluneq/angular,manekinekko/angular,matsko/angular,angular-indonesia/angular,IdeaBlade/angular,mhevery/angular,matsko/angular,rkirov/angular,shairez/angular,gnomeontherun/angular,ghetolay/angular,rkirov/angular,ultrasonicsoft/angular,vicb/angular,LucasSloan/angular,brandonroberts/angular,gdi2290/angular,Toxicable/angular,blesh/angular,sarunint/angular,LucasSloan/angular,Brocco/angular,ocombe/angular,ultrasonicsoft/angular,kegluneq/angular,brandonroberts/angular,alxhub/angular,heathkit/angular,jonrimmer/angular,dsebastien/angular,ocombe/angular,filipesilva/angular,ocombe/angular,sarunint/angular,blesh/angular,manekinekko/angular,juristr/angular,vicb/angular,gkalpak/angular,alexeagle/angular,robwormald/angular,angular/angular,shairez/angular,dsebastien/angular,trshafer/angular,mgiambalvo/angular,manekinekko/angular,chuckjaz/angular,gdi2290/angular,jonrimmer/angular,mzgol/angular,ghetolay/angular,ValtoFrameworks/Angular-2,mgechev/angular,trshafer/angular,gdi2290/angular,sarunint/angular,mgiambalvo/angular,matsko/angular,vicb/angular,filipesilva/angular,mgiambalvo/angular,jasonaden/angular,gkalpak/angular,IgorMinar/angular,vikerman/angular,cironunes/angular,mlaval/angular,mlaval/angular,kegluneq/angular,gdi2290/angular,wKoza/angular,jonrimmer/angular,mhevery/angular,vikerman/angular,vicb/angular,petebacondarwin/angular,ultrasonicsoft/angular,sarunint/angular,dsebastien/angular,robwormald/angular,heathkit/angular,blesh/angular,robwormald/angular,ultrasonicsoft/angular,StephenFluin/angular,ValtoFrameworks/Angular-2,heathkit/angular,mgol/angular,mprobst/angular,ghetolay/angular,cironunes/angular,cironunes/angular,mlaval/angular,mprobst/angular,aboveyou00/angular,gdi2290/angular,mgol/angular,brandonroberts/angular,petebacondarwin/angular,aboveyou00/angular,wKoza/angular,manekinekko/angular,vikerman/angular,mprobst/angular,wKoza/angular,gkalpak/angular,Toxicable/angular,IdeaBlade/angular,IgorMinar/angular,ultrasonicsoft/angular,dsebastien/angular,JiaLiPassion/angular,cironunes/angular,shairez/angular,kara/angular,blesh/angular,kara/angular,JiaLiPassion/angular,filipesilva/angular,LucasSloan/angular,mgol/angular,IgorMinar/angular,ocombe/angular,rkirov/angular,IgorMinar/angular,gdi2290/angular,ValtoFrameworks/Angular-2,mzgol/angular,Brocco/angular,shairez/angular,brandonroberts/angular,vicb/angular,brandonroberts/angular,IgorMinar/angular,mzgol/angular,alexeagle/angular,StephenFluin/angular,angular-indonesia/angular,aboveyou00/angular,gnomeontherun/angular,juristr/angular,NathanWalker/angular,blesh/angular,angular-indonesia/angular,kara/angular,angular/angular,StephenFluin/angular,Brocco/angular,alexeagle/angular,IdeaBlade/angular,mlaval/angular,alxhub/angular,jasonaden/angular,mhevery/angular,jonrimmer/angular,wKoza/angular,trshafer/angular,petebacondarwin/angular,sarunint/angular,petebacondarwin/angular,cironunes/angular,mgol/angular,mgechev/angular,angu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