[CL-13820] Add class to remove link underline

[vleague2]

🎟️ Tracking

PM-13820

📔 Objective

This PR adds an explicit class to the link directive to remove underline. Some clients and default browser stylesheets add an underline, so we can't rely on no underline being the default state.

📸 Screenshots

Before	After

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (ps/extension-refresh@4f1becf). Learn more about missing BASE report.
Report is 9 commits behind head on ps/extension-refresh.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                   Coverage Diff                   @@
##             ps/extension-refresh   #11762   +/-   ##
=======================================================
  Coverage                        ?   33.56%           
=======================================================
  Files                           ?     2810           
  Lines                           ?    87367           
  Branches                        ?    16653           
=======================================================
  Hits                            ?    29325           
  Misses                          ?    55740           
  Partials                        ?     2302           

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