ciq-cherry-pick should detect GKH linux-stable shas and appropreately set commit header

[PlaidCat]

As seen in this PR ctrliq/kernel-src-tree#271 (comment) there is a desire to be able to use GKH-stable LongTerm commit shas when they actually match up to what we can use in the Rocky LTS kernels.

Things that need to happen:

• If provided sha cannot be found in linus-mainline then fall back to long term kernel.
• Parse long term message for upstream sha, its format has changed since they started doing this
  • Validate that the sha is valid in LInus's tree (just in case)
• Find the Tag that the GKH sha belongs too and included it in the upstream-diff to reference which LongTerm branch it belongs too.

See this as a format reference:
ctrliq/kernel-src-tree#271 (comment)

The look up can basically be done like this

git tag --sort=creatordate --contains <sha> | head -n1

This will give the first tag the sha belongs to.