Override "Accept-Language" header if WebDriver BiDi emulated language is present.

[lutien]

• At least two implementers are interested (and none opposed):
  • Chromium
  • Mozilla
• Tests are written and can be reviewed and commented upon at:
  • Add checks for "Accept-Language" to tests for "emulation.setLocaleOverride" command. web-platform-tests/wpt#55587
• Implementation bugs are filed:
  • Chromium: …
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1995691
  • WebKit: N/A
  • Deno (not for CORS changes): N/A
• MDN issue is filed: N/A
• The top of this comment includes a clear commit message to use.

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

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[lutien]

@sadym-chromium, could you create an issue for it on your side?