Investigate possibly incorrect `SwiftBuildSystem` mapping of `taskSignature` to `taskID`

[bripeticca]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI. The description text must include reproduction steps with either of command-line SwiftPM commands, swift build, swift test, swift package etc.

Description

While implementing swiftlang/swift-package-manager#9362 there was some discussion about the fact that task signatures should be globally unique with a single taskID mapping to a single task signature, however it was noted that this was not always the case.

In the specific case found, the duplication of the taskSignature -> many taskIDs aided in reducing duplicate output.

Investigate whether this is intentional.

Expected behavior

No response

Actual behavior

No response

Steps to reproduce

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Swift Package Manager version/commit hash

No response

Swift & OS version (output of swift --version ; uname -a)

No response