Remove modelserving Templates CR folder

[lucferbux]

Closes https://issues.redhat.com/browse/RHOAIENG-2883

Description

Removes the Custom Serving Runtime template folder from dashboard to transfer ownership to the model serving team.

How Has This Been Tested?

No testing from our side, just removing the unused files

Test Impact

No testing coverage needed

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Commits have been squashed into descriptive, self-contained units of work (e.g. 'WIP' and 'Implements feedback' style messages have been removed)
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change (find relevant UX in the SMEs section).

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[lucferbux]

/hold waiting to https://issues.redhat.com/browse/RHOAIENG-860 to be merged

[andrewballantyne]

Waiting on dependant PR: opendatahub-io/odh-model-controller#189

Release hold when it merges.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andrewballantyne

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[heyselbi]

@andrewballantyne @lucferbux this PR is ready to be merged. PR in odh-model-controller is merged.

[andrewballantyne]

/unhold

Model Serving is taking over the manifests, their PR has merged. Unholding.