Add Functions managed identity test program

[chlowell]

For manual testing. Closes #12183

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[richardpark-msft]

Looks like a great start. Are you planning on doing this automatically at some point as well?

[RickWinter]

@chlowell What is remaining on this PR to get it completed?

[chlowell]

It's ready to merge. I've been holding off because a bicep file would be better than the markdown readme but haven't had the cycles to figure that out.

[chlowell]

/check-enforcer override