Add `assert packages match` function to replace odd old API

[dholth]

Checklist

• [X] I added a descriptive title
• [X] I searched open requests and couldn't find a duplicate

What is the idea?

We have a validate_converted_files_match_streaming function in validate.py with a weird interface "returns details about mismatched files", that exists only to support the existing transmute CLI function.

There is no reason to convert a .conda to .tar.bz2 and then need details about which files did not convert correctly. Instead, an exception should be raised an the faulty file should be deleted. The assertion-style interface will be easier to use compared to checking that the list of differences is empty.

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Thanks!