[CrOS Cellular] Block user custom APNs if specified by admin.

If AllowAPNModification *exists* and is set to false, then user defined
custom APNs will not be propagated to shill. This is done by adding
'CustomAPNList' to the list of recommended (not enforced) properties
if AllowAPNModification is not specified (not provided
and sent by DPanel) or if is specified and set to true. Otherwise,
the CustomAPNList will be set to an empty list.

video for clarification:
https://drive.google.com/file/d/1e9HRbuNsSu90d1Vb3pChAj3dKU_R1KA4/view?usp=sharing

Bug: b/162365553
Test: chromeos_components_unittest
Change-Id: I0be5a21114837c3f8676ef4a340f7f47e9a118db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5615650
Reviewed-by: Nikhil Nayunigari <nikhilcn@google.com>
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Chad Duffin <chadduffin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1315474}
6 files changed
tree: 7f1ad73287ca37c377dc1b4ceca94c1202ee89dd
  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. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  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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