[Test] Let's introduce some smoke e2e tests for images in use

[jstourac]

We have run into bunch of issues with the images pointing to an incorrect location recently, e.g.:

• Fix pytorch image reference in main to commit 17c2e49 #293
• Fix the pytorch image reference to commit 88211f5 #247
• or wrong hash - missing last character or extra space

To avoid these in the future, we could add some simple e2e tests to PROW CI that will check the content of the params.env file and spins up particular images so it checks that:

• actual image with that tag exists
• some chosen metadata check for each referred image
• content of the file is in expected format
• any other ideas?

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These checks shall be introduced to this repo, downstream repo and, if possible, also into live builds repo.

[jstourac]

PoC here:

• Add a GitHub action to perform validation of params.env file jstourac/notebooks#2
• Add a GitHub action to perform validation of params.env file #429