Add docs for cherry pick workflow on RELEASE.md

[ffjlabo]

What this PR does / why we need it:

as title

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 22.84%. Comparing base (c24ce35) to head (3e6aa30). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5158 +/- ## ========================================== + Coverage 22.82% 22.84% +0.02% ========================================== Files 412 412 Lines 43833 43833 ========================================== + Hits 10003 10013 +10 + Misses 33040 33031 -9 + Partials 790 789 -1 ```

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