[Fix #10145] Update Style/SelectByRegexp to ignore cases where the receiver appears to be a hash

[dvandersluis]

Since hash.grep does not work in the same way as other enumerables, this update looks for receivers that look like hashes and does not register Style/SelectByRegexp offenses on them. This includes literal hashes ({}), Hash.new, Hash[], to_h and to_hash (the latter two could potentially cause a false negative if they're overridden to not return hashes, but I can live with that).

I added explicit tests for receivers that I have confirmed works as expected (array, range, set). In case we ever extend this with more exceptions those will be covered.

Fixes #10145.

---

Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[bbatsov]

Looks good!

[ghiculescu]

@dvandersluis could you also exclude ENV here? I think is guaranteed to be a Hash

[koic]

@ghiculescu That makes sense. I've opened #10457. Thank you for the feedback.