Remove `gl-font-weight-100` and `gl-font-weight-300`

Summary

In [CSS utilities TG] Font weight > Migrate to Tai... (#456641 - closed) • Lorenz van Herwaarden • 17.1 we noticed there are only 2 occurrences of gl-font-weight-300 and only 1 occurrence of gl-font-weight-100 in GitLab. We would prefer not to use 100 and 300 weights because these are quite thin and not ideal for legibility/accessibility.

Possibly they can all be replaced with gl-font-weight-normal.

Occurrences

  1. 100: job_group_dropdown.vue#L126
  2. 300: section_details.vue#L181
  3. 300: pre_scan_verification_status.vue#L68
Edited by Lorenz van Herwaarden