Flutter Framework Beta 1.21.0-9.2.pre cherry picks

[christopherfujino]

I accidentally closed #64680 and cannot re-open, so I'm recreating the PR with this one.

Scheduled cherrypicks

• Engine cherry picks Flutter Engine Beta 1.21.0-9.2.pre cherry picks engine#20797
• Cannot return with NULL from Isolate: Exception
  • Issue Cannot return with NULL from Isolate: Exception: Isolate exited without result or error #63590
  • PR allow null in compute for weak mode #63515
  • Commit afc95099
  • Author @a14n
• Wrong hour/minute order in TimePicker
  • Issue Wrong hour/minute order in timePicker in RTL mode #63427
  • PR [Material] Relanding fix to ensure time picker input mode lays out correctly in RTL #64097
  • Author @rami-a

Test/Infra Only Cherrypicks

• [flutter_tool] Handle Windows line endings in packages_test.dart #63806
• [flutter_tool] Fix some create_test.dart tests on Windows #63796

[flutter-dashboard]

This pull request was opened from and to a release candidate branch. This should only be done as part of the official Flutter release process. If you are attempting to make a regular contribution to the Flutter project, please close this PR and follow the instructions at Tree Hygiene for detailed instructions on contributing to Flutter.

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[googlebot]

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[googlebot]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

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[christopherfujino]

@a14n would you mind letting the CLA bot know it's ok to cherry pick your commit?

[a14n]

@googlebot I consent

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[christopherfujino]

@a14n thanks!

[pcsosinski]

approved. engine hash shows a web test failing FYI