Tested maven plugin

[DrAlexD]

What's done:

• updated diktat-analysis.yml files for all examples.
• added multi-module maven example.
• tested single-module and multi-module maven examples.
• tested githubActions via -Ddiktat.githubActions=true.
• tested reporters.

Closes #1792

[codecov[bot]]

Codecov Report

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

Comparison is base (3c572f1) 78.27% compared to head (617d8a6) 78.27%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1823 +/- ## ========================================= Coverage 78.27% 78.27% Complexity 2432 2432 ========================================= Files 131 131 Lines 8603 8603 Branches 2173 2173 ========================================= Hits 6734 6734 Misses 903 903 Partials 966 966 ```

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