Merge branch 'replace_header_mr_icon' into 'master'

Replace header merge request icon

Closes #31088

See merge request !10932

Former-commit-id: 61afa9b5

app/views/shared/icons/_mr_bold.svg

-<svg width="15" height="20" viewBox="0 0 12 14" xmlns="http://www.w3.org/2000/svg"><path d="M1 4.967a2.15 2.15 0 1 1 2.3 0v5.066a2.15 2.15 0 1 1-2.3 0V4.967zm7.85 5.17V5.496c0-.745-.603-1.346-1.35-1.346V6l-3-3 3-3v1.85c2.016 0 3.65 1.63 3.65 3.646v4.45a2.15 2.15 0 1 1-2.3.191z" fill-rule="nonzero"/></svg>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="m5 5.563v4.875c1.024.4 1.75 1.397 1.75 2.563 0 1.519-1.231 2.75-2.75 2.75-1.519 0-2.75-1.231-2.75-2.75 0-1.166.726-2.162 1.75-2.563v-4.875c-1.024-.4-1.75-1.397-1.75-2.563 0-1.519 1.231-2.75 2.75-2.75 1.519 0 2.75 1.231 2.75 2.75 0 1.166-.726 2.162-1.75 2.563m-1 8.687c.69 0 1.25-.56 1.25-1.25 0-.69-.56-1.25-1.25-1.25-.69 0-1.25.56-1.25 1.25 0 .69.56 1.25 1.25 1.25m0-10c.69 0 1.25-.56 1.25-1.25 0-.69-.56-1.25-1.25-1.25-.69 0-1.25.56-1.25 1.25 0 .69.56 1.25 1.25 1.25"/><path d="m10.501 2c1.381.001 2.499 1.125 2.499 2.506v5.931c1.024.4 1.75 1.397 1.75 2.563 0 1.519-1.231 2.75-2.75 2.75-1.519 0-2.75-1.231-2.75-2.75 0-1.166.726-2.162 1.75-2.563v-5.931c0-.279-.225-.506-.499-.506v.926c0 .346-.244.474-.569.271l-2.952-1.844c-.314-.196-.325-.507 0-.71l2.952-1.844c.314-.196.569-.081.569.271v.93m1.499 12.25c.69 0 1.25-.56 1.25-1.25 0-.69-.56-1.25-1.25-1.25-.69 0-1.25.56-1.25 1.25 0 .69.56 1.25 1.25 1.25"/></svg>
+

changelogs/unreleased/replace_header_mr_icon.yml

+---
+title: Replace header merge request icon
+merge_request: 10932
+author: blackst0ne