fix: pollish evidence gathering

[jkowalleck]

followup of #1309

• fixed some false-positives for license evidences.
• refactored some functionality, so that it is much easier to add #1310 later

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: -0.60%	:white_check_mark: 94.44% (target: 80.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (18e703474f87152bae26e935d288f48a0ebaf1d8) | 672 | 630 | 93.75% | | | Head commit (3e653be272450393ff85ddbe344b663945983456) | 657 (-15) | 612 (-18) | 93.15% (**-0.60%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#1312) | 72 | 68 | **94.44%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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