UI5 / cli / 35082389536

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test(project): Add failing BuildServer test for determineBuildSignature staleness

Capture the status quo: a running BuildServer computes each project's build
signature exactly once (BuildContext memoizes the ProjectBuildContext for the
server's lifetime), so a custom task's determineBuildSignature callback is
never re-evaluated. Changing an input the callback reads (here an on-disk
control file outside the watched source paths) while the server runs is
therefore silently ignored, and the server keeps serving a stale build result.

The new test asserts the desired behavior — the change is reflected without a
server restart — and is marked test.failing since the current behavior does
not do this. The build-signature custom task now also appends the control
value to test.js so the served output observably depends on the callback input.

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