fix(tests): allow bounded main queue drain timeout

[teamleaderleo]

Tests added by #15381 call the shared drainMainQueue(timeout:) helper, but the helper only accepted the no-argument form. The app-host test product therefore failed to compile at every timeout call site.

Add an optional timeout parameter while preserving the existing one-second default. This keeps the tests' bounded main-queue spin behavior and restores compilation for all current callers.

Validation:

• swiftc -parse cmuxTests/TabManagerUnitTests.swift
• python3 scripts/verify-local.py --only swift-syntax --swift-changed origin/main
• git diff --check

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Summary by cubic

Fixes test compilation by letting drainMainQueue(timeout:) accept an optional timeout parameter while keeping the one-second default, so tests can bound their main-queue drain time.

^{Written for commit 7a51764. Summary will update on new commits.}

[coderabbitai]

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• cmuxTests/TabManagerUnitTests.swift

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CI failure attribution

CI failed on 7a51764720 (run 36778620428 attempt 1): 1 code.

Job	Verdict	Why
macos / macOS compile admission	code	a compile error

Matched log lines

macos / macOS compile admission: /tmp/cmux-ci/src/CLI/CMUXCLI+AutoNaming.swift:271:16: error: cannot find 'usesTemporaryConfig' in scope

Not re-run automatically: macos / macOS compile admission is not a machine failure.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's.

[teamleaderleo]

The fleet compile exposed an independent auto-naming error in the moving main base (usesTemporaryConfig), which is already owned by #16233. This PR remains limited to the shared drainMainQueue(timeout:) test-helper signature; #16233 should land before this PR is rechecked.

[austinywang]

main's cmuxTests bundle has three independent compile errors right now: drainMainQueue(timeout:) (#16232), CMUXCLI.vmReadyPollInterval (#16242), and PaneResizeShortcutTests' missing controller binding, dropped in #15420's merge resolution. A PR with only one fix still fails compile admission on the other two. #16245 carries all three, with this PR's commit byte for byte, so whichever lands second merges cleanly. Happy to close #16245 if you'd rather combine them here.

[teamleaderleo]

Closing in favour of #16245, which makes the same drainMainQueue(timeout:) change and also fixes the controller binding in PaneResizeShortcutTests and the CMUXCLI.vmReadyPollInterval assertion that cannot resolve from the app-host target. Between #16245 and #16260 the app-host test product compiles again; full attribution is on #16245.