RemoteModule only check required capabilities for a given endpoint

According to changes in bazelbuild/remote-apis#76 (and discussion in bazelbuild/remote-apis#61):
> Each endpoint should implement the Capabilities service, and populate the fields relevant to the services available at that endpoint. Clients may choose to ignore irrelevant capabilities if the client does not plan to use a given service on the specified endpoint.

This PR:
1. Refactor `RemoteModule` to use a `ChannelFactory` when creating channels so that tests can mock into channels connected to a fake server.
2. Add tests for verifying server capabilities.
3. Only check required capabilities for a given endpoint.
    - If `--remote_executor` and `--remote_cache point` to the same endpoint, we require that endpoint has both execution and cache capabilities.
    - If they point to different endpoints, we check the endpoint with execution or cache capabilities respectively.

Fixes #11901.

Closes #12008.

PiperOrigin-RevId: 329875749
7 files changed
tree: 3722d4dedcf0e35590886f5439007fd59d65ee65
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEBASE.md
  15. CODEOWNERS
  16. combine_distfiles.py
  17. combine_distfiles_to_tar.sh
  18. compile.sh
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. distdir.bzl
  22. ISSUE_TEMPLATE.md
  23. LICENSE
  24. README.md
  25. WORKSPACE
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