Reland "[OOBE] Introduce lazy loading mechanism"

This is a reland of commit abe5c7331e1d7d98dcd182fdbdc74c6dc8e9aa43
The original CL uncovered an erroneous ChromeVox test that became flakier because it interacts with the tts extension at the same time
that OOBE loads.

Original change's description:
> [OOBE] Introduce lazy loading mechanism
>
> Introduce a lazy loading mechanism that prioritizes the Welcome Screen
> during the OOBE flow.
>
> Bug: b:266939445
> Change-Id: If900fffb9884c15231f2ac5695cc468e3d079dc0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4496156
> Reviewed-by: Danila Kuzmin <dkuzmin@google.com>
> Commit-Queue: Renato Silva <rrsilva@google.com>
> Cr-Commit-Position: refs/heads/main@{#1147442}

Bug: b:266939445
Change-Id: I7118e9ad0dffb1dbc16be65a89266a89de24efd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4556335
Reviewed-by: Danila Kuzmin <dkuzmin@google.com>
Commit-Queue: Renato Silva <rrsilva@google.com>
Cr-Commit-Position: refs/heads/main@{#1148080}
19 files changed
tree: bdbf2f31ee1d4c306d3b8228e9b0f70dfc7d369c
  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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