Migrate font weight utilities to Tailwind in ./ee for vue and js files

What does this MR do and why?

Related #456641 (closed)

This migrates font-weight utilities to Tailwind variant:

• gl-font-weight-normal -> gl-font-normal
• gl-font-weight-bold -> gl-font-bold

in *.vue and *.js files in directory ./ee.

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

gl-font-normal in ee/app/assets/javascripts/boards/components/board_add_new_column.vue

gl-font-bold in ee/app/assets/javascripts/security_dashboard/components/shared/vulnerability_report/selection_summary.vue

How to set up and validate locally