Fix a false positive in regexp rule

This MR is based upon !62 (closed) which has the following description. This MR adds a CHANGELOG and tests.

What does this MR do?

This comment will fix a false positive in the gitlab.eslint.detect-non-literal-regexp rule. After running semgrep and eslint rules on the (lodash)[https://github.com/lodash/lodash/commit/2f79053d7bc7c9c9561a30dda202b3dcd2b72b90] repository, semgrep flagged on (this)[https://github.com/lodash/lodash/blob/2f79053d7bc7c9c9561a30dda202b3dcd2b72b90/test/merge.test.js#L201] codeline that eslint did not flag on. This is a false positive because we are only concerned about calls to new Regexp that have an argument passed into the call.

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
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  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer