Pretty print Supported Program Types enum

[cosenal]

Since the introduction of the Supported Program Types enum in #2276, some error messages are not printed in a pretty way. This PR fixes that. From

...
Circuit types supported by Mitiq are 
<enum 'SUPPORTED_PROGRAM_TYPES'>.

to

...
Circuit types supported by Mitiq are 
braket, cirq, pennylane, pyquil, qibo, qiskit.

[codecov[bot]]

Codecov Report

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

Project coverage is 98.22%. Comparing base (8b9ba75) to head (7330905).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2352 +/- ## ======================================= Coverage 98.22% 98.22% ======================================= Files 87 87 Lines 4056 4059 +3 ======================================= + Hits 3984 3987 +3 Misses 72 72 ```

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