add pragma - cli files

[scharlottej13]

• partially addresses Misleading test coverage report #5445 for distributed/utils_test.py:

Pragma no cover

• We have cases with relatively long switch-like statements ending in a final exception, e.g. ValueError "unknown value"
• Conditional imports may need be covered with pragma statements and/or a dedicated job

Moved this into a separate PR from #5749. Copying @fjetter's comment:

I'm wondering if the entire CLI module should be ignored. Can we get reliable coverage information from this?

[GPUtester]

Can one of the admins verify this patch?

[github-actions]

Unit Test Results

       17 files   -        1         17 suites   - 1   10h 0m 7s ⏱️ - 24m 4s
  2 596 tests ±       0    2 512 ✔️  -        5       80 💤 +    1  2 ❌ +2  2 🔥 +2 
21 864 runs   - 1 366  20 529 ✔️  - 1 229  1 331 💤  - 141  2 ❌ +2  2 🔥 +2 

For more details on these failures and errors, see this check.

Results for commit e9c8e4b. ± Comparison against base commit 91f899e.