Migrate Elyra to KFP v2 (cont.)

[caponetto]

What changes were proposed in this pull request?

Moving forward with the work started in #3219

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[harshad16]

lgtm

just few details:

• we removed kfp-tekton in initial work as it only support kfp 1.x , not kfp 2.x.
  The project: https://github.com/kubeflow/kfp-tekton/releases, is updating time to time, so in case someone wants to include tekton support, would need to check and accommodate it. As kfp itself is aligning on argo, perhaps going forward with that way be the best, based on my observation.
• Some changes are explicit of the ODH.

[caponetto]

Thanks for the review, @harshad16! I'll look into the points you've raised.

[lresende]

Could we remove the tekton options and docs as well ?

[codecov]

Codecov Report

Attention: Patch coverage is 77.98165% with 24 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@f38c645). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
elyra/tests/pipeline/kfp/test_kfp_processor.py	81.70%	15 Missing ⚠️
elyra/pipeline/kfp/kfp_processor.py	52.63%	9 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3273   +/-   ##
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  Coverage        ?   82.83%           
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  Files           ?      161           
  Lines           ?    19830           
  Branches        ?      509           
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  Hits            ?    16426           
  Misses          ?     3220           
  Partials        ?      184           

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[harshad16]

/lgtm