gh: add /cherry-pick comment for release

[cnvergence]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Release Notes: Yes/No

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.57%. Comparing base (e56785c) to head (d411eb1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8224   +/-   ##
=======================================
  Coverage   73.57%   73.57%           
=======================================
  Files         242      242           
  Lines       37000    37000           
=======================================
  Hits        27224    27224           
- Misses       7854     7855    +1     
+ Partials     1922     1921    -1     

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[cnvergence]

@zirain @arkodg just had this idea, would help our release process, I think
Let's test it out. I can also try to implement it in the envoy's toolshed later.

[rudrakhp]

Won't it fail if there are conflicts during cherry pick that we used to resolve manually?

[cnvergence]

it will fail for these cases, but for those without, it will ease up picking some of the PRs