[vm] Fix standalone{,_2}/io/issue_30687_test to operate in custom temp directory
All of our tests relying on filesystem operations should operate in a
randomly created temporary directory. This ensures the test will not
interact badly with other tests - running in parallel.
This particular test couldn't be run multiple times concurrently,
since it would cause races to FSE creation/deletion.
TEST=Fixes iso-stress builder issue (which runs tests repeatedly in parallel)
Change-Id: I8b2e015bf4b6a9ecdfa471eb2ec887e634c2b233
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/206783
Reviewed-by: Tess Strickland <sstrickl@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
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