Custom roles instrumentation part 2

What does this MR do and why?

• Count the total number of member role records
• Instrumented number of users with custom role here: !110852 (merged)
• Closes #382255 (closed)

Screenshots or screen recordings

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.