build: annotate markdown lint failures in pull requests
Add a problem matcher for output from remark-lint to our lint-md GitHub Actions CI workflow so that any markdown linter failures are annotated in the pull request in the web UI.
Refs: https://github.com/actions/toolkit/blob/master/docs/problem-matchers.md Refs: https://github.com/actions/toolkit/blob/master/docs/commands.md#problem-matchers
Checklist
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commit message follows commit guidelines