Clean up owned ArgsResolver temporary directories

[aryansk]

Fixes #1720

What changed

• Track ownership of the temporary directory created internally by ArgsResolver.
• Remove internally-owned temporary directories during resolver deinitialization while preserving caller-owned directories.
• Keep explicit cleanup behavior intact and add a regression test for deinitialization cleanup.

Validation

• swift test --filter JobExecutorTests.temporaryDirectoryIsRemovedOnResolverDeinit — 1 test passed.
• The checkout retains existing compiler warnings; the focused test passes.