Move markdownlint to `make lint`

Pedro Pombeirorequested to merge
move-markdownlint into 9524-add-shellcheck-linter

⚠ This branch is currently based off of 9524-add-shellcheck-linter ⚠

What does this MR do?

  • Moves the execution of markdownlint to the make lint target.
  • Widens the scope of markdownlint to files outside of docs/**, namely dockerfiles/** and files at the repo root.

Why was this MR needed?

  • To make make lint more encompassing and catch more documentation issues, as well as to add it to the Code Climate report.

What's the best way to test this MR?

Run make lint and reintroduce some of the fixed issues.

What are the relevant issue numbers?

#26789

Edited by Pedro Pombeiro

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