[BNPL] Not adding linked issuer when flag is disabled

This CL updates the BNPL linked issuer caching logic, so that when flag
`kAutofillEnableBuyNowPayLaterForExternallyLinked` is disabled, an
externally linked issuer will not be cached.

Screenshots with Klarna externally linked:
Flag enabled: https://screenshot.googleplex.com/7yhsiSPR8vFBzg3.png
Flag disabled: https://screenshot.googleplex.com/3nWyfpPbmib8BD6.png

Bug: b:447657701
Change-Id: I56f3b775b40234ccac6c4c323675a99b8369be45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6989001
Reviewed-by: Vinny Persky <vinnypersky@google.com>
Commit-Queue: Yishui Liu <yishuil@google.com>
Cr-Commit-Position: refs/heads/main@{#1521567}
2 files changed
tree: fd55320d954f9459f598393250b4d5317379af5b
  1. .gemini/
  2. .github/
  3. agents/
  4. android_webview/
  5. apps/
  6. ash/
  7. base/
  8. build/
  9. build_overrides/
  10. buildtools/
  11. cc/
  12. chrome/
  13. chromecast/
  14. chromeos/
  15. codelabs/
  16. components/
  17. content/
  18. crypto/
  19. dbus/
  20. device/
  21. docs/
  22. extensions/
  23. fuchsia_web/
  24. gin/
  25. google_apis/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. net/
  34. pdf/
  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. .cursorignore
  54. .geminiignore
  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. CRYPTO_OWNERS
  72. DEPS
  73. DIR_METADATA
  74. LICENSE
  75. LICENSE.chromium_os
  76. OWNERS
  77. PRESUBMIT.py
  78. PRESUBMIT_test.py
  79. PRESUBMIT_test_mocks.py
  80. README.md
  81. SECURITY_OWNERS
  82. WATCHLISTS
README.md

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