Renovate to renovate branch

[dcousens]

As is, we have 8+ renovate pull requests for updating patch dependencies.
The Require branches to be up to date before merging for main results in a high maintenance burden and context-switching workflow as you need to wait for all the CI tests to pass and the branch to rebase each time you want to merge.

The new suggested strategy is to merge all passing renovate pull requests to a renovating branch, and at our discretion merge that renovating branch back to main on a periodical basis, verifying that the renovating->main pull request is additionally passing.

This allows us to side-step problematic renovate pull requests such as the #6810 which has some long-term baggage in respect to problematic dependency resolutions, or things like #6769 where eslint 8 has a bug that is preventing us from merging that at this time.

edit: we had to rename renovate to renovating, git does not support sub-branches (that is, you can't have renovate and renovate/foo, which @renovate-bot automatically creates)

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