[Fix #8617] Style/HashAsLastArrayItem no longer flags hashes if all elements in an array are hashes

[dvandersluis]

Fixes #8617.

Style/HashAsLastArrayItem currently changes arrays of hashes so that the final hash has no braces (if EnforcedStyle: no_braces is set). This PR changes that behaviour so that an array of all hashes is ignored.

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Before submitting the PR make sure the following are checked:

• 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.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[bbatsov]

I think it's also a good idea to mention explicitly in the cop description that it will ignore such arrays.

[dvandersluis]

@bbatsov made the requested changes! Please let me know if you want me to reword anything.

[bbatsov]

The changes look good, but your branch has to be rebased on top of the current master branch due to merge conflicts.

[dvandersluis]

@bbatsov rebased and updated the note!

[bbatsov]

Looks good!