remove spellcheck tests altogether #277
Description
When a PR edits .github/workflows/spellcheck.yml (example #244), Mergify requires the spellcheck test to succeed. However, spellcheck tests do not run on this repo, because someone has disabled it. As a result, mergify cannot merge the PR even with multiple approvals, and developers must merge the PR manually over Mergify.
Here's the decision to disable spellcheck in the core repo: instructlab/instructlab#3130
If we intend to keep spellcheck permanently disabled, we should remove it from the tree, specifically spellcheck.yml and .mergify.yml.