Return exit code 1 when not all errors are fixed

[nulls]

What's done:

• calculate only not fixed errors
• return 1 when there are errors

[github-actions[bot]]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

   166 files  ±0     166 suites  ±0   6m 32s :stopwatch: + 1m 33s 1 426 tests ±0  1 382 :heavy_check_mark:  - 6  38 :zzz: ±0  6 :x: +6  2 805 runs  ±0  2 761 :heavy_check_mark:  - 6  38 :zzz: ±0  6 :x: +6 

For more details on these failures, see this check.

Results for commit 45acaca5. ± Comparison against base commit 8b44e13e.

[github-actions[bot]]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

   166 files  ±0     166 suites  ±0   7m 21s :stopwatch: -10s 1 426 tests ±0  1 403 :heavy_check_mark:  - 6  17 :zzz: ±0  6 :x: +6  2 805 runs  ±0  2 782 :heavy_check_mark:  - 6  17 :zzz: ±0  6 :x: +6 

For more details on these failures, see this check.

Results for commit 45acaca5. ± Comparison against base commit 8b44e13e.

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (3ba0fb0) 78.42% compared to head (348c702) 78.40%.

Files	Patch %	Lines
...c/main/kotlin/com/saveourtool/diktat/DiktatMain.kt	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1868 +/- ## ============================================ - Coverage 78.42% 78.40% -0.02% Complexity 2465 2465 ============================================ Files 134 134 Lines 8695 8697 +2 Branches 2199 2200 +1 ============================================ Hits 6819 6819 - Misses 897 899 +2 Partials 979 979 ```

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