Fix behavior of ignores

[brynary]

The Ignore struct is being used for two entirely different purposes. First, it is used for exclude_patterns which filter files out of analysis. Also, it is used for post-processing, to suppress specific issues based on plugin/rule/level filtering.

These two usages have come together in an emergent behavior with a pretty bad bug -- If you have an [[ignore]] block without a file_patterns specifier, it will exclude all files from all analysis.

To fix this properly, this will require some data re-architecture and more tests, but want to get a hotfix out right away.

[qltysh]

Diff Coverage: The code coverage on the diff in this pull request is 100.0%.

Total Coverage: This PR will increase coverage by 0.01%.

File Coverage Changes

Path	File Coverage Δ	Indirect
qlty-check/src/planner/plugin_workspace_entry_finder_builder.rs	0.7
qlty-config/src/library.rs	0.5	√

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