Add an eslint rule to flag extra newlines
What does this MR do?
Adds a rule to disallow multiple empty lines in a row, and fixes all of the existing lints in the codebase.
Does this MR meet the acceptance criteria?
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Changelog entry added -
All builds are passing -
Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if it does - rebase it please) -
Squashed related commits together