[CI] Use sccache installed in docker image in xla build #153002
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The edited comment should have the info
Sccache stopped working at some point near dec 17 2023. I think it was having trouble writing to the cache.
Either way, there is an sccache already installed on the docker image, so we should use that instead of a binary from s3 which we're probably no longer sure where it came from/what commit it was built from
The one in the docker image is installed here https://github.com/pytorch/xla/blob/69d438ee65cc250c974ca80edd80462ffbb2e163/.github/upstream/Dockerfile#L61 and is also very old, so I have pytorch/xla#9102 to update it