ci: automatically cherry-pick changes from release/candidate

[github-actions]

Cherry pick from the original PR:

• ci: automatically cherry-pick changes from release/candidate #1894

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

We have to manually cherry-pick changes from release/candidate into develop. Which leads to human error and forgotten commits.

Solutions

Porting the work @Garzas has done on Reloaded into Kalium:

• chore: cherry pick from rc to develop wire-android#1951

Which does:

• Add a new GitHub workflow that will listen for merged PRs into release/candidate
• Cherry pick the merge commit
• Push to a new branch with -cherry-pick suffix
• Create a new PR with:
  • same assignee
  • same title
  • same body
  • cherry-pick label

Note: When this PR is merged, it will automatically open a PR on develop as well :)

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.