[23.1] Include workflow invocations in default activity

[mvdbeek]

also adjusts the title to Workflow Invocations and changes the help text to refer to workflow runs.
Maybe we should at least partially favor workflow runs or workflow executions over invocations, since that is probably better known to users.

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[hexylena]

workflow runs or workflow executions

yeah definitely! it's likely to be a lot more easily understood. Either of these is a lot better and more easily comprehended.