Determine options for disable warning for generated filenames that already exist in test suite

[clach04]

Impacts same test for multiple file types:

python -m puren_tonbo.tests.testsuite   TestFileSystemNotesWriteFunctionSaveEncryptedCompressedZlib.test_filename_gen_one_with_password_already_exist

Results in successful test and warnings to stderr:

mylogger __init__.py:1401 note_contents_save_native_filename() - WARNING - generated filename 'C:\\Users\\clach04\\AppData\\Local\\Temp\\TestFileSystemNotesWrite_tmpe0c6ndx_\\one.gz' already exists, generating alternative

TestFileSystemNotesWriteFunctionSaveRawPlainText.test_filename_gen_one_with_password_already_exist() deliberately tests to make sure that derived duplicate filenames do NOT result in data loss, instead a similar named file will be created. The current code always warns when this happens.

Consider adding a new option (dictionary, class) parameter into note_contents_save_filename() / note_contents_save_native_filename() to allow more options without an API change to allow this to be disabled (temporarily) when this one test is ran.