Cop/LineBreakAroundConditionalBlock: Don't check for HAML files programmatically

What does this MR do and

Checking files programmatically is slow and Include/Exclude` is preferred.

With HAML lint, instead disable this cop in .haml-lint.yml:

linters:
  RuboCop:
    enabled: true
    ignored_cops:
      - Cop/LineBreakAroundConditionalBlock