cherry-pick(release-v1.3.x): Add GH workflows for cherry-picking PRs to release branches

[service-binding-operator-bot]

Changes

This PR adds GH workflows to automate release-branch cherry-picking process. It goes as follows - as soon as the release-labeled PR to master is merged:

• A cherry-pick PR branch is created based on the release branch label of the original PR
• Original PR commit from master is cherry-picked and added on top of the cherry-pick PR branch
• A cherry-pick PR is sent from the cherry-pick PR branch to the release branch
• Normal PR checking flow is excercised including all the CI and approval
• Once the cherry-pick PR is merged the cherry-pick PR branch is deleted

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs
  included if any changes are user facing
• Tests
  included if any functionality added or changed. For bugfixes please include tests that can catch regressions
• All acceptance test scenarios included in the PR which verifies a bugfix or a requested feature reported by a non-member are tagged with @external-feedback tag.
• Follows the commit message standard

[codecov]

Codecov Report

Merging #1268 (f9b0df2) into release-v1.3.x (b44aa84) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-v1.3.x    #1268   +/-   ##
===============================================
  Coverage           58.06%   58.06%           
===============================================
  Files                  33       33           
  Lines                2797     2797           
===============================================
  Hits                 1624     1624           
  Misses               1018     1018           
  Partials              155      155           

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