feat(css): add gl-text-transform-capitalize utility

mentioned in commit 0270766d

mentioned in merge request status-page!579 (merged)

mentioned in merge request gitlab!93292 (merged)

mentioned in merge request gitlab!93501 (closed)

mentioned in merge request gitlab-docs!2985 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!2988 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!86 (closed)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!87 (merged)