[CI] Make cache_lit_timing_files.py Script Gracefully Fail (#162316) This is a performance optimization and does not impact test fidelity. There have been some flakes where this script will fail to download files, exit with code 1, causing the job to fail before it even starts running tests. This is undesirable as the tests will only run 10-15% slower without this, so catch the exceptions and emit a warning we can track later in the rare case we cannot download the timing files. This fixes #162294.
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