1.3.0 release is breaking js_image_layer

[alexeagle]

#313 removes support for .tar.gz file extensions, but rules_js produces them
https://github.com/aspect-build/rules_js/blob/main/js/private/js_image_layer.bzl#L230

#313 says

Non-tar files never actually worked here

But this test has been passing https://github.com/aspect-build/rules_js/blob/main/e2e/js_image_oci/src/test.yaml#L6 so I think that may be incorrect, and we should just revert #313.

FYI @mattyclarkson as this originated from #302

[mattyclarkson]

My issue was with .tar.xz, so it's likely it recognises .tar.gz as that's what it compresses the layers to anyway.

[alexeagle]

Okay thanks, that sounds like the right resolution then, I should have been more conservative in the breaking change.