[After 2.26 release] Remove code for obsolete features

[ahmedwaleedmalik]

What this PR does / why we need it:
Removes unrequired remanent code for features that were deprecated and removed a long time ago.

Which issue(s) this PR fixes:

Fixes #

What type of PR is this?

/kind cleanup

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

NONE

Documentation:

NONE

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from ahmedwaleedmalik. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• modules/web/src/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ahmedwaleedmalik]

This doesn't add enough value for it to be merged during code freeze. Let's get back to this after 2.26 has been released.

/hold

[kubermatic-bot]

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

Test name	Commit	Details	Required	Rerun command
pre-dashboard-web-integration-tests-ce	c956650	link	true	/test pre-dashboard-web-integration-tests-ce
pre-dashboard-web-integration-tests	c956650	link	true	/test pre-dashboard-web-integration-tests

Full PR test history

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.