[Subtask] Improved Gradle Build Scripts for Python Module

[xunliu]

Describe the subtask

Currently, Clients/client-python/build.gradle.kts import java plugin to support gradle test command,
But the python module doesn't actually depend on this plugin, and must add below config in the build.gradle.kts.

  compileJava {
    dependsOn(pipInstall)
  }

  spotlessJava {
    dependsOn(pipInstall)
  }

Maybe we can improve this script, and delete these.

Parent issue

#2113

[xunliu]

This issue fixed by #2753, So I closed this issue.