Remove git from prebuild and use PNC Konflux tooling

[rnc]

This PR:

• simplifies current pre-build by removing git source functionality from it
• Ensures the mw-pipeline sets a default of the PNC konflux tooling
• keeps JBS current functionality by moving the git source commit into another task and tacking it onto the pipeline

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.06%. Comparing base (1088a89) to head (782d6e8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2328      +/-   ##
============================================
+ Coverage     43.86%   44.06%   +0.20%     
  Complexity      785      785              
============================================
  Files           278      278              
  Lines         13290    13339      +49     
  Branches       1339     1339              
============================================
+ Hits           5829     5878      +49     
  Misses         6867     6867              
  Partials        594      594              

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[rnc]

Not ideal but now the prebuild is targeted at PNC not JBS and therefore the ability to dynamically remove plugins isn't available (plugin manipulation will be handled earlier in repour).

[rnc]

Bit of hard-coding here - normally JVM_BUILD_SERVICE_REQPROCESSOR_IMAGE is used but now prebuild is targeted at PNC and uses the separate https://github.com/project-ncl/konflux-tooling project we need to split them out and hardcode this.

[openshift-ci]

@rnc: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/jvm-build-service-in-repo-e2e	6688bc2	link	true	/test jvm-build-service-in-repo-e2e

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