More scalability improvements

[schustmi]

Describe changes

This PR contains three small changes to improve the scalability of our server:

• Retry on 502 and 504 requests to the cloudapi. These responses sometimes happen because of high RBAC load
• Disable RBAC checks for users and workspaces. These permissions are part of any tenant role anyway and nothing in ZenML works for users that do not have this permission. For that reason, we decided to temporarily disable RBAC for these entities.
• Try the most likely case (fetching an existing run) when trying to get or create the pipeline run from within step execution. For all steps of a pipeline run except the first one, this will successfully return a run instead of trying to replace and or create the run first. This reduces the amount of RBAC and DB calls for all non-first steps.

One other unrelated change:

• Delete some unused code and simplify model version URL logging

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• If my change requires a change to docs, I have updated the documentation accordingly.
• I have added tests to cover my changes.
• I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
• If my changes require changes to the dashboard, these changes are communicated/requested.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

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[github-actions]

E2E template updates in examples/e2e have been pushed.