Reenabling ReplaceWithSuggestion for FS1129

[psfinaki]

Closes #15887

This just started working after this fix.
Hence just readding the diag removed in this PR and the corresponding test.

[psfinaki]

/azp ru

[psfinaki]

/azp run

[azure-pipelines]

Command 'ru' is not supported by Azure Pipelines.

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[psfinaki]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).