Standardize test data setup for E2E tests

[qweeah]

For now, command suites require pre-baked storage image in distribution storage layout. Once #378 finishes, mount files can be changed to OCI layout so the preparation process can be done via oras copy

See original discussion:
> Looks like there is very docker-specific env setup. Should probably standardize on that also.

The env setup now is based on mount files in distribution storage layout. ZOT storage is designed based on OCI layout so it's not compatible. We will definitely standardize the setup process when ORAS support OCI layout target.

Originally posted by @qweeah in #709 (comment)

[github-actions]

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[qweeah]

This is a critical testing issue if we want to move to OCI image and distribution spec 1.1.0 and tested based on ZOT.

[TerryHowe]

What tasks are left to complete this?