Move cortex verification from serve.py to run.sh

[vishalbollu]

Catch image version mismatch earlier so to make errors such as #1178 easier to debug for users who've created custom images.

Since start_uvicorn.py has quite a bit of application code, the image version verification should happen before start_uvicorn.py is run.

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checklist:

• run make test and make lint
• test manually (i.e. build/push all images, restart operator, and re-deploy APIs)
• update examples
• update docs and add any new files to summary.md (view in gitbook after merging)
• cherry-pick into release branches if applicable
• alert the dev team if the dev environment changed

[RobertLucian]

I just saw the review request notification now. Even though this has been merged, I can say this LGTM. Makes sense to place the verification outside the Python script.