Description of problem:
cockpit-composer should do value check for some fields, that obviously unreasonable or invalid value that customer input in the field cannot be accepted.

Please see attached screenshot, in these screenshots, I input 999999999 for raw image disk size, I input abcdefg for repo-url which should be a http url. And create wizard accepts these values and can go the final step.

Version-Release number of selected component (if applicable):

How reproducible:
100%

Steps to Reproduce:
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Actual results:

Expected results:

Additional info: