Default silent to platform convention

[marcoscaceres]

Closes #193

• [x] At least two implementers are interested (and none opposed):
  • WebKit
  • Chromium per https://github.com/whatwg/notifications/pull/194#issuecomment-1551191216
• [x] Tests are written and can be reviewed and commented upon at:
  • https://github.com/web-platform-tests/wpt/pull/40160
• [x] Implementation bugs are filed:
  • Chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=1446893
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1834005
  • WebKit: https://bugs.webkit.org/show_bug.cgi?id=256828
• [x] MDN issue is filed: https://github.com/mdn/content/issues/26812

(See WHATWG Working Mode: Changes for more details.)

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[rayankans]

Thanks for the proposal Marcos, agreed that the default should be platform specific, and is an overall improvement. The change looks good to me, and happy to apply the changes from the chromium side of things.

[marcoscaceres]

Small set of tests are coming as part of https://github.com/WebKit/WebKit/pull/13912

(reviewed upstream)

I’ll send them to WPT hopefully tomorrow.

[marcoscaceres]

Implementer bugs filed.

[marcoscaceres]

Tests sent at https://github.com/web-platform-tests/wpt/pull/40160 (reviewed upstream)