Repository graph should have visual difference between branches and tags
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=585836) </details> <!--IssueSummary end--> This is essentially the same issue as #325877 and #1539. Both issues were closed without resolution. **Problem:** Repository graphs currently display branches and tags with the same style (white text on dark gray "bubble") and this makes it difficult to distinguish them at a glance. **Suggestion:** It would be preferable to have a different visual style for branches and tags. For example, branches could retain the dark gray bubble, while tag bubbles could adopt the colour of the graph nodes; something like the image below. Of course, other solutions exist. Thanks. ![tag.png](/uploads/afc4ae6ff4fd8518c72e19eece266144/tag.png){width=166 height=388}
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