Enable xla build caching (#82342)
### Description
<!-- What did you change and why was it needed? -->
Enable cloud caching for xla build.
### Issue
<!-- Link to Issue ticket or RFP -->
Addresses #78182
### Testing
<!-- How did you test your change? -->
The change/caching was tested in the downstream [workflow](https://app.circleci.com/pipelines/github/pytorch/xla/12306/workflows/ca613a3c-de81-40ad-8498-72ebc65d42f6/jobs/27211)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82342
Approved by: https://github.com/clee2000
