[utils] Use a consistent namespace alias for utils

[ricab]

Normalize uses of mu to mpu, which was already in use and is more in line with the three-letter norm for multipass namespace aliases.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.82%. Comparing base (62c4fc6) to head (f7f9b52).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3544 +/- ## ======================================= Coverage 88.82% 88.82% ======================================= Files 253 253 Lines 14121 14121 ======================================= Hits 12543 12543 Misses 1578 1578 ```

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[ricab]

Hey @sharder996, to merge th private side the public side should be merged first. Is this where you thought it had been merged?

[sharder996]

Oh, yes. I thought this had been merged. I will add it to the queue.