refactor(bazel): update api-extractor bazel tool to only accept a single input (#43431)
refactor(bazel): update api-extractor bazel tool to only accept a single input (#43431)

Updates the API extractor tool used by the `ng_module` rule to only
accept a single entry-point file. This change is made in preparation
for APF v13 where this logic is no longer needed.

The logic previously only existed to also bundle the `r3_symbols` file.
This file is no longer needed in APF v13 because Angular core no longer needs
to be processed with `ngcc`. This allows us to clean up this logic which
helps simplifying `ng_module`.

Consumers that use an older version of `@angular/core` should
respectively also use a compiler-cli version matching the core
version.

PR Close #43431

ocombe/angular,brandonroberts/angular,ocombe/angular,shairez/angular,brandonroberts/angular,manekinekko/angular,brandonroberts/angular,JiaLiPassion/angular,angular-indonesia/angular,gnomeontherun/angular,gnomeontherun/angular,gkalpak/angular,angular/angular,manekinekko/angular,manekinekko/angular,angular/angular,gnomeontherun/angular,ocombe/angular,angular/angular,ocombe/angular,shairez/angular,gkalpak/angular,ocombe/angular,angular-indonesia/angular,angular/angular,JiaLiPassion/angular,shairez/angular,manekinekko/angular,ocombe/angular,gkalpak/angular,manekinekko/angular,angular-indonesia/angular,brandonroberts/angular,gnomeontherun/angular,gkalpak/angular,angular-indonesia/angular,JiaLiPassion/angular,shairez/angular,brandonroberts/angular,manekinekko/angular,JiaLiPassion/angular,shairez/angular,brandonroberts/angular