refactor: remove underline in h2 warning alert

[ruibaby]

What type of PR is this?

/area ui
/kind improvement
/milestone 2.20.x

What this PR does / why we need it:

before:

after:

Does this PR introduce a user-facing change?

None

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.02%. Comparing base (d7aba83) to head (a2883c4).
Report is 35 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6849      +/-   ##
============================================
- Coverage     57.03%   57.02%   -0.02%     
- Complexity     3978     3999      +21     
============================================
  Files           713      714       +1     
  Lines         23992    24098     +106     
  Branches       1570     1584      +14     
============================================
+ Hits          13685    13743      +58     
- Misses         9696     9743      +47     
- Partials        611      612       +1     

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

[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• ui/OWNERS [JohnNiang]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment