[Instant Hotspot] Add tether hosts status message and display when none found

Adds tether hosts status message to QS detailed view page. Also displays
error message if no tether hosts are found.

Test: deployed to cellular DUT (with instant-hotspot-rebrand enabled)
before to connecting to tether host and with a connected Pixel 7 phone.

Screenshot (no tether hosts found):
https://screenshot.googleplex.com/6WE3wEMfAoLpsGt

Screenshot (with connected tether host):
https://screenshot.googleplex.com/5gCCJLk6qdqFaNW

Bug: b/298656342
Change-Id: Ia63685b6a2460420f400ab15ef75c357a76e5dc7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4812459
Reviewed-by: Chad Duffin <chadduffin@chromium.org>
Commit-Queue: Rudransh Dikshit <rudranshd@google.com>
Cr-Commit-Position: refs/heads/main@{#1217251}
3 files changed
tree: 0a41025658c3c9395fafa5c29e5661dc8b333ef1
  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. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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