Update $gray-10 from #fafafa to #f5f5f5 (!90297) · Merge requests · GitLab.org / GitLab · GitLab

What does this MR do and why?

This MR updates the $gray-10 value to the recent updates we introduced to the Pajamas Design System with gitlab-org/gitlab-services/design.gitlab.com#1369 (closed), gitlab-ui!2868 (merged) & gitlab-org/gitlab-services/design.gitlab.com!2892 (merged)

Screenshots or screen recordings

Before	After
`#fafafa`	`#f5f5f5`

Related to #361641 (closed)