feat: only request to fill username for social links in forms

[snitin315]

Refers #4609

Short description of what this resolves:

Made social media links on all forms in a way that users only need to add their username or other short forms.

Changes proposed in this pull request:

Additional info

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/eventyay/open-event-frontend/4j34nlji5
✅ Preview: https://open-event-frontend-git-fork-snitin315-feat-social-username.eventyay.vercel.app

[codecov]

Codecov Report

Merging #4943 into development will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #4943      +/-   ##
===============================================
- Coverage        22.86%   22.85%   -0.02%     
===============================================
  Files              484      484              
  Lines             5129     5133       +4     
  Branches            18       18              
===============================================
  Hits              1173     1173              
- Misses            3952     3956       +4     
  Partials             4        4              

Impacted Files	Coverage Δ
app/components/widgets/forms/link-input.js	27.58% <0.00%> (-4.42%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 81bb963...b3f5592. Read the comment docs.

[mariobehling]

The recent changes resulted in only covering very few social media services. Services that were previously covered in this feature are no longer covered, e.g.

• GitHub
• Gitlab
• Vimeo
• Blog
• Flickr
• Any other major social media platform
• Custom (User should be able to add own detail here)

Please add other major services and enable the user to use "Custom".

E.g. = example. It does not mean only the mentioned services should be covered. All services that were previously covered should still be covered after the changes. Therefore reopening this issue. Thanks.