Remote: Fix performance regression in "upload missing inputs". (#15998)

The regression was introduced in 702df847cf32789ffe6c0a7c7679e92a7ccccb8d where we essentially create a subscriber for each digest to subscribe the result of `findMissingBlobs`.

This change update the code to not create so many subscribers but maintain the same functionalities.

Fixes #15872.

Closes #15890.

PiperOrigin-RevId: 463826260
Change-Id: Id0b1c7c309fc9653a47c5df95c609b34e6510cde
6 files changed
tree: 5d6bce8ee420637cb34506cf5fa9e95afb0f36d7
  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. CODE_OF_CONDUCT.md
  15. CODEBASE.md
  16. CODEOWNERS
  17. combine_distfiles.py
  18. combine_distfiles_to_tar.sh
  19. compile.sh
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. distdir.bzl
  23. distdir_deps.bzl
  24. ISSUE_TEMPLATE.md
  25. LICENSE
  26. README.md
  27. SECURITY.md
  28. WORKSPACE
  29. WORKSPACE.bzlmod
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