[ci] Add cache cleanup workflow (#32675)

> Caches have branch scope restriction in place. This means that if
caches for a specific branch are using a lot of storage quota, it may
result into more frequently used caches from default branch getting
thrashed. For example, if there are many pull requests happening on a
repo and are creating caches, these cannot be used in default branch
scope but will still occupy a lot of space till they get cleaned up by
eviction policy. But sometime we want to clean them up on a faster
cadence so as to ensure default branch is not thrashing.


https://github.com/actions/cache/blob/main/tips-and-workarounds.md#force-deletion-of-caches-overriding-default-cache-eviction-policy
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* __->__ #32675
* #32674