[ISSUE #4705] Remove redundant Gradle build task 'jar'

[Pil0tXia]

Fixes #4705.

Motivation

When writing this PR apache/eventmesh-site#170, I noticed this build task.

Gradle build task jar is already depended by dist and included in build, so there is no need to excute it.

Modifications

Remove task jar from compilation commands.

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bd2aeb9) 17.39% compared to head (794b8b1) 17.37%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4706      +/-   ##
============================================
- Coverage     17.39%   17.37%   -0.03%     
- Complexity     1759     1760       +1     
============================================
  Files           797      797              
  Lines         29850    29891      +41     
  Branches       2579     2574       -5     
============================================
+ Hits           5192     5193       +1     
- Misses        24177    24219      +42     
+ Partials        481      479       -2     

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[harshithasudhakar]

LGTM