Added linter ignore and coverage ignore for multiple file generation

[cmenkemeller]

Issue

When generating files using output_format: mutliple_files, resulting files should have lint ignored and coverage disabled, similar to main generated file.

Solution

• Added pre-defined comments too ignore lint and disable coverage for these generated files
• Updated tests to reflect new code lines
• Added additional warning that these files are generated and should not be edited

[Tienisto]

Thanks!