[7.17] dra: slack/email with the branch (backport #7630)

[mergify]

This is an automatic backport of pull request #7630 done by Mergify.

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Mergify commands and options

More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

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Finally, you can contact us on https://mergify.com

[ghost]

🤖 GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /hey-apm : Run the hey-apm benchmark.

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• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)