go/analysis/passes/shadow: include filename in cross-file shadow error messages

[bkreitch]

Improve shadow analyzer error messages to include the filename when
the shadowed declaration is in a different file.

Fixes golang/go#74843

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Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-08-01T23:31:18Z","revision":"f296c20964323eb8d873f24b84384bf4410f4ca7"}

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Patch Set 5: -Commit-Queue

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This CL has failed the run. Reason:

Tryjob golang/try/x_tools-go1.23-windows-amd64 has failed with summary (view all results):

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• go on release-branch.go1.23 (commit 8fa31a2) / tools on master (change 692396)

To reproduce, try gomote repro 8707695905016383569.

Additional links for debugging:

• test golang.org/x/tools module output

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Patch Set 5: LUCI-TryBot-Result-1

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Patch Set 6: Commit-Queue+1

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Bot data: {"action":"start","triggered_at":"2025-08-02T10:58:23Z","revision":"f06f14a6877937080da87021e7ad8b51ba5563e8"}

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Patch Set 6: -Commit-Queue

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Patch Set 6: Code-Review+1

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