Tailwind: Migrate heading utility classes
What does this MR do and why?
Tailwind: Add heading utility classes from type scale
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
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How to set up and validate locally
Apply gl-heading-*
classes to test them.
Related to #452225 (closed)
Closes #456639 (closed)