debug slow windows temp purge

[IanButterworth]

I'm not sure why Windows is so much slower than other platforms.
Some rudimentary benchmarking here done on all Github CI runners doesn't show the Windows runners as outliers in cpu or disk io (the analysis is crude though)..
IanButterworth/SystemBenchmark.jl#8 (comment)

[IanButterworth]

Some path cleanup jobs are very slow on Windows, but most are <<1s
These are all that are > 1s

Windows

Test Summary: | Pass  Broken  Total      Time
Pkg           | 3258       2   3260  41m13.5s
[ Info: temp_cleanup_purge started
┌ Info: C:\Users\runneradmin\AppData\Local\Temp\jl_FIOQpu took 1.3071288 seconds
│   contents =
│    2-element Vector{String}:
│     "Project.toml"
└     "src"
┌ Info: C:\Users\runneradmin\AppData\Local\Temp\jl_tGKtvr took 165.7193711 seconds
│   contents =
│    2-element Vector{String}:
│     "loaded_depot"
└     "registry_depot"
┌ Info: C:\Users\runneradmin\AppData\Local\Temp\jl_sUpiWl took 1.0247196 seconds
│   contents =
│    6-element Vector{String}:
│     "clones"
│     "compiled"
│     "logs"
│     "packages"
│     "registries"
└     "scratchspaces"
┌ Info: C:\Users\runneradmin\AppData\Local\Temp\jl_DZAS4U took 145.986978 seconds
│   contents =
│    1-element Vector{String}:
└     "registry_depot"
temp_cleanup_purge(force = true): 316.891713 seconds (5.22 M allocations: 383.824 MiB, 0.41% gc time, 0.20% compilation time)

Linux

Test Summary: | Pass  Broken  Total      Time
Pkg           | 3278       2   3280  21m47.3s
[ Info: temp_cleanup_purge started
┌ Info: /tmp/jl_QjyQib took 1.704146616 seconds
│   contents =
│    1-element Vector{String}:
└     "registry_depot"
┌ Info: /tmp/jl_y9iBfz took 1.768122787 seconds
│   contents =
│    2-element Vector{String}:
│     "loaded_depot"
└     "registry_depot"
temp_cleanup_purge(force = true): 4.140046 seconds (1.57 M allocations: 151.227 MiB, 0.99% gc time, 14.00% compilation time)

[IanButterworth]

There are a few upstream issues/regressions reported

actions/checkout#1186

actions/runner-images#7320