Updates to the Flutter cherry-pick process to align with our current
practices. This update:
1. Defaults to automated cherry-picks.
2. Removes the need to create cherry-pick issues.
3. Requires cherry-pick authors to update CHANGELOG.md.
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Co-authored-by: Christopher Fujino <christopherfujino@gmail.com>
Make it more clear that every design doc has a corresponding github tracking issue with appropriate label.
*Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.*
*List which issues are fixed by this PR. You must list at least one issue. An issue is not required if the PR fixes something trivial like a typo.*
*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*
