Several link handling fixes

[mejo-]

📝 Summary

• fix(LinkBubble): Remove custom blur/focus handling
• fix(LinkBubble): Use debounce instead of custom debounce implementation
• fix(link): Insert full URLs for links to Nextcloud files
• fix(link): Don't rewrite links with fileId inside Collectives
• fix(link): Prevent middle-click from opening two tabs on Firefox
• test(cypress): Don't hide LinkBubble on scroll event in Cypress
• fix(ActionInsertLink): Sync NcActionInput value property (Fixes: #5324, Fixes: #5003)

🏁 Checklist

• [x] Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• [x] Sign-off message is added to all commits
• [x] Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• [x] Documentation (README or documentation) has been updated or is not required