Reland "[fuchsia] Migrate web_engine_shell to launch web_instance.cm"

This is a reland of commit 986da2599c8db5910f87cd27acb5c00810aba7c0
with the following differences:

- web_engine_shell.cmx has been removed, as the use of v2 APIs to launch
  web_instance.cm renders it inoperable.
- Documentation has been updated to illustrate how to run
  web_engine_shell.cm.
- Application of the deprecated-allowed-packages test facet has been
  fixed.
- fuchsia.tracing.provider.Registry is now routed dynamically by
  WebInstanceHost conditionally based on the VULKAN ContextFeatureFlag.

Original change's description:
> [fuchsia] Migrate web_engine_shell to launch web_instance.cm
>
> In so doing:
>
> - A relauncher is introduced to launch a new component between
>   test_manager and web_engine_shell when WebInstanceHost is used, as
>   this is required for it to route capabilities to WebEngine.
> - WebInstanceHost now supports the test-only --with-webui switch to run
>   a WebEngine with access to WebUI resources.
> - WebInstanceHost now destroys any active children upon destruction
>   rather than requiring that the consumer wait for them to exit.
>
> Bug: 1280703
> Change-Id: I8481b854542524f7eef69d66059ff1767ba60f93
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4134846
> Reviewed-by: Wez <wez@chromium.org>
> Auto-Submit: Greg Thompson <grt@chromium.org>
> Commit-Queue: Greg Thompson <grt@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1095363}

Bug: 1280703
Change-Id: Ic29f67e3876ab2304bc515af85b742b7a596994f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4200488
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Auto-Submit: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1104206}
16 files changed
tree: 6de3c08e2fb1058b050e97ccd89e423ae6e2d238
  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. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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