fix(c): don't skip conan files from `file-patterns` and scan `.conan2` cache dir

[DmitriyLewen]

Description

This PR fixes detected issues for conan.lock files:

• scan .conan2 fir (and CONAN_HOME env) to detect licenses
• don't skip files from file-patterns

Related issues

• Close #6946
• Close #6931

Related PRs

• [x] #6329
• [x] #6357

Checklist

• [x] I've read the guidelines for contributing to this repository.
• [x] I've followed the conventions in the PR title.
• [x] I've added tests that prove my fix is effective or that my feature works.
• [x] I've updated the documentation with the relevant information (if needed).
• [ ] I've added usage information (if the PR introduces new options)
• [ ] I've included a "before" and "after" example to the description (if the PR is a user interface change).