Use Depot for Windows cargo test
#14122
Merged
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Replaces #12320
Switches to Depot for the large Windows runner we use for
cargo test.The runtime goes from 8m 20s -> 6m 44s (total) and 7m 18s -> 4m 41s (test run) which are 20% and 35% speedups respectively.
A few things got marginally slower, like Python installs went from 11s -> 38s, the Rust cache went from 15s -> 30s, and drive setup went from 7s -> 20s.