[CI][UI Next][V1.0.0-Alpha] Add frontend UI to CI checks and fix the linting problems found

[kezhenxu94]

Remove unused declarations and variables to make CI passed

[codecov-commenter]

Codecov Report

Merging #8666 (e94c7d3) into dev (2f21c89) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head e94c7d3 differs from pull request most recent head c2a8d14. Consider uploading reports for the commit c2a8d14 to get more accurate results

@@             Coverage Diff              @@
##                dev    #8666      +/-   ##
============================================
+ Coverage     45.30%   45.31%   +0.01%     
- Complexity     4073     4075       +2     
============================================
  Files           700      700              
  Lines         27045    27045              
  Branches       2894     2894              
============================================
+ Hits          12252    12256       +4     
+ Misses        13639    13637       -2     
+ Partials       1154     1152       -2     

Impacted Files	Coverage Δ
...e/dolphinscheduler/remote/NettyRemotingClient.java	53.52% <0.00%> (+2.81%)	⬆️

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[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
5 Code Smells

0.0% Coverage
20.7% Duplication

[songjianet]

LGTM