[Extensions MV2] Update metrics for unsupported deprecation phase

Chrome has announced that MV2 extensions will gradually no longer be
supported in the browser. See more information at
https://developer.chrome.com/blog/resuming-the-transition-to-mv3.

Update metrics emission for the new phase:
* Add a new "hard-disabled" state for MV2 extensions, emitted on
  profile startup.
* Don't emit UKM for extensions in the new phase. The only actions
  available to the user are removal and finding alternatives.

Update tests for the same.

Bug: 367395349
Change-Id: Ib1abe38616a9fd01fdf4e77ad3af495b3d9a165f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5884573
Reviewed-by: Emilia Paz <emiliapaz@chromium.org>
Reviewed-by: Justin Lulejian <jlulejian@chromium.org>
Commit-Queue: Justin Lulejian <jlulejian@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1359145}
4 files changed
tree: b12b7590e2451f35ffa1698205767a552f96d9e3
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. google_update/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitallowed
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. CPPLINT.cfg
  70. CRYPTO_OWNERS
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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