Follow up issues for the prebuilds pages

[gtsiolis]

Some follow up items from the Prebuilds pages added back in #4876.

• 1. Optimize SVG files, see Prebuilds Page #4876 (comment).
• 2. Remove the Settings tab from the project page, see Prebuilds Page #4876 (comment).
• 3. Truncate commit message, see Prebuilds Page #4876 (comment).
• 4. Add a label near the default branch, see Prebuilds Page #4876 (comment).
• 5. Add branch update timestamp, see Prebuilds Page #4876 (comment).
• 6. Use a shorter git commit hash, see Prebuilds Page #4876 (comment).
• 7. Remove the prebuild status filter on the active branches list, see Prebuilds Page #4876 (comment).
• 8. Implement active branch search, see Prebuilds Page #4876 (comment).
• 9. Consider renaming the header for active branches, see Prebuilds Page #4876 (comment).
• 10. Open prebuild page when triggering a prebuild from the active branches list, see Prebuilds Page #4876 (comment).
• 11. Remove Cancel Prebuild action from the more action dropdown of the active branch items, see Prebuilds Page #4876 (comment).
• 12. Remove the hyphen when there's no prebuild information, see Prebuilds Page #4876 (comment).
• 13. Add triggerrer avatar information, see Prebuilds Page #4876 (comment).
• 14. Add missing spacing on the header on the prebuild page, see Prebuilds Page #4876 (comment).
• 15. Add a loading state for fetching active branches and prebuilds, see Prebuilds Page #4876 (comment). Needs visual design. ⚠️

🍋 🍋 🍋 🍋

• 16. Replace a quick hack for context URL in server component, see Prebuilds Page #4876 (comment).

🍊 🍊 🍊 🍊

• 17. Besides these UX related issues there were some test commits merged, see Prebuilds Page #4876 (comment) and relevant discussion (internal).

[AlexTugarev]

Reopening, as not all tasks are done yet.

[gtsiolis]

@AlexTugarev I'd suggest to open a couple of follow up issues for the remaining tasks instead of reopening a closed issue. This can help us move faster and tackle issues separately if needed. What do you think?

1. Added Optimize SVG files used for icons #5036 for point 1.
2. Added Add triggerrer avatar information in prebuilds #5035 for point 13.
3. Added Improve performance for fetching active branches and prebuilds #5038 for point 15.

[AlexTugarev]

@gtsiolis, sounds good!