Draft: Resolve "[CI] pyaudio3dtools extra prints, missing copyright headers under tests"

• Related issues: #1291
• Requested reviewers: @kiene

Reason why this change is needed

Running several objective evaluations floods the console unnecessarily with debug prints and a warning that is intended to be suppressed.

Description of the change

• Remove two unnecessary print statements in cmp_pcm.py and audioarray.py

• Force suppressing warning of divide by zero in audioarray.py. Those cases are handled separately.

• NB: This MR does not add the missing copyright headers.

Affected operating points

Pure CI routine change and everything is BE/BC.

Related to #1291