feat: Enforce limit of URLs for link buttons

[Jiralite]

Please describe the changes this PR makes and why it should be merged:

• Add maximum length for a button URL discord/discord-api-docs#7301

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
discord-js	⬜️ Ignored (Inspect)			Jul 23, 2025 9:27am
discord-js-guide	⬜️ Ignored (Inspect)			Jul 23, 2025 9:27am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.42%. Comparing base (3a060f7) to head (c696769).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11011   +/-   ##
=======================================
  Coverage   44.42%   44.42%           
=======================================
  Files         308      308           
  Lines       17585    17585           
  Branches     1749     1749           
=======================================
  Hits         7813     7813           
  Misses       9759     9759           
  Partials       13       13           

Flag	Coverage Δ
builders	79.98% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.