test: relax validation of TEST_BUILDKIT_IMAGE to reduce direct dependencies #1818
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commit 2d124e0 (#1770) added some integration-tests, and as part of those tests added github.com/distribution/distribution/v3 as a direct dependency.
github.com/distribution/distribution/v3 is unreleased, and is still receiving backward breaking changes. While this dependency is already used elsewhere, it looks like the only use in buildx was for a sanity check of the custom TEST_BUILDKIT_IMAGE; we can probably relax that check to avoid adding the direct dependency.