Improving CONTRIBUTING.md for backport details (#23057)

See the changes.

Two key points:
* Necessary enhancements could be backported.
* The backports shouldn't break downgrade  between minor releases.
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@ -299,9 +299,7 @@ known as the release freeze. All the feature pull requests should be
merged before feature freeze. And, during the frozen period, a corresponding
release branch is open for fixes backported from main branch. Release candidates
are made during this period for user testing to
obtain a final version that is maintained in this branch. A release is
maintained by issuing patch releases to only correct critical problems
such as crashes or security issues.
obtain a final version that is maintained in this branch.
Major release cycles are seasonal. They always begin on the 25th and end on
the 24th (i.e., the 25th of December to March 24th).
@ -311,6 +309,16 @@ for the previous version. For example, if the latest, published release is
v1.2, then minor changes for the previous release—e.g., v1.1.0 -> v1.1.1—are
still possible.
The previous release gets fixes for:
- Security issues
- Critical bugs
- Regressions
- Build issues
- Necessary enhancements (including necessary UI/UX fixes)
The backported fixes should avoid breaking downgrade between minor releases as much as possible.
## Maintainers
To make sure every PR is checked, we have [team