Return global offenses for Naming/FileName and Naming/InclusiveLanguage

[Earlopain]

When checking against filenames, a global offense should be added. The current behaviour causes problems in things like LSPs that inspect the offense for location information since some operations on these offenses will raise a IndexError.

I've tweaked the specs for InclusiveLanguage since they just passed without any changes. With the annotation expectations, it actually checks the offense location (or lack thereof).

require "rubocop"

processed_source = RuboCop::ProcessedSource.new("", 3.3)
range = Class.new.extend(RuboCop::Cop::RangeHelp).send(:source_range, processed_source.buffer, 1, 0)
offense = RuboCop::Cop::Offense.new(:info, range, "global offense", "Naming/FileName", :unsupported)
offense.highlighted_area.begin_pos
=> # .../gems/parser-3.3.0.5/lib/parser/source/buffer.rb:274:in `fetch': index 0 outside of array bounds: 0...0 (IndexError)

As a note, Style/Copyright can add a offense in exactly the same way. However, since it supports autocorrect just switching to add_global_offense is not possible.

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• 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.

[koic]

Thanks!