WIP feat(frontend,backend): Remove deprecated Python-based Visualizations

[Zxenith]

Description of your changes:
Removes deprecated Python-based visualizations, including predefined and custom categories, along with the visualization server.

Fixes: #11133

It is a revival of #11134

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[google-oss-prow]

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[google-oss-prow]

Hi @Zxenith. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[hbelmiro]

/ok-to-test

[github-actions]

Approvals successfully granted for pending runs.

[milinddethe15]

Hey @Zxenith, are you working on this PR?

[Zxenith]

Hey @Zxenith, are you working on this PR?

@milinddethe15 yes I am still working on it in my local environment. Sorry about the delay, still debugging :)

[juliusvonkohout]

@Zxenith @milinddethe15 you can also work on it together :-) Maybe have a zoom call together. In the end it is a revival / rebase of #11134

[Zxenith]

@juliusvonkohout absolutely will do that! It would be much easier for us both if we work on the PR together. @milinddethe15 can I contact you via mail?

[milinddethe15]

@milinddethe15 can I contact you via mail?

Yes, sure

[milinddethe15]

/retest

[milinddethe15]

/retest

[hbelmiro]

/ok-to-test

[github-actions]

Approvals successfully granted for pending runs.

[Zxenith]

/retest

[juliusvonkohout]

@hbelmiro @HumairAK i think the test failures come from the removal of the deprecated old visualization server. May we remove the tests / code for it ? Normal v1 pipelines run without it.