[frontend] Improve the Apply buttons in Suggestions (#9291)

[CelineSebe]

Proposed changes

• Change color & add tooltip

Related issues

• Buttons not clear in Suggestions #9291

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.34%. Comparing base (4af08e1) to head (4191766).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9465      +/-   ##
==========================================
+ Coverage   65.33%   65.34%   +0.01%     
==========================================
  Files         624      624              
  Lines       59696    59698       +2     
  Branches     6684     6688       +4     
==========================================
+ Hits        39004    39012       +8     
+ Misses      20692    20686       -6     

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