Add files exist flag for coverage publish

[marschattha]

With the --files-exist flag the publish command will check if files exist on the file system and if not it will ignore it, to have the same behaviour as classic, but is this the best way to handle it?

[qltysh]

Diff Coverage: The code coverage on the diff in this pull request is 92.9%.

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

File Coverage Changes

Path	File Coverage Δ	Indirect
qlty-cli/src/commands/coverage/publish.rs	-0.1
qlty-config/src/library.rs	0.5	√
qlty-coverage/src/publish/planner.rs	0.2
qlty-coverage/src/publish/processor.rs	3.0	√
qlty-coverage/src/transformer.rs	0.7

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• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

• Total Coverage: Coverage for the whole repository, calculated as the sum of all File Coverage. Learn more.

• File Coverage: Covered Lines divided by Covered Lines plus Missed Lines. (Excludes non-executable lines including blank lines and comments.)

  • Indirect Changes: Changes to File Coverage for files that were not modified in this PR. Learn more.