Merge branch '523029-issuable-sidebar-link-design-tokens' into 'master'

Use text.color.link for hover color in issuable sidebar controls

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183307



Merged-by: Paulina Sedlak-Jakubowska <psedlak-jakubowska@gitlab.com>
Approved-by: Jeremy Elder <jelder@gitlab.com>
Approved-by: Buck O'Leary <bucoleary@gitlab.com>
Approved-by: Paulina Sedlak-Jakubowska <psedlak-jakubowska@gitlab.com>
Co-authored-by: sdejonge <sdejonge@gitlab.com>