test: clean up apply_patch allow-session artifact

[jif-oai]

Why

The approving_apply_patch_for_session_skips_future_prompts_for_same_file integration test writes apply_patch_allow_session.txt under the process cwd while exercising outside-workspace patch approval behavior. With just test now being the normal validation path, that file can be left behind in the checkout when the test runs or fails, creating confusing untracked state.

What changed

• Registers the resolved apply_patch_allow_session.txt path with tempfile::TempPath before the test removes and recreates it through apply_patch.
• Preserves the existing outside-workspace path shape so the approval behavior under test does not change.
• Lets TempPath remove the generated file when the test exits, including panic paths.

Verification

• just test -p codex-core --test all approving_apply_patch_for_session_skips_future_prompts_for_same_file

[jif-oai]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

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