Fix duplicate init ResolverSpec registration warning in has_patterns

[jamie256]

There are some improvements pending in whylogs to make managing the UDF registrations easier in the scenarios we need to change them. This change checks for the old structure of the resolver specs, and then removes the duplicate UDFs similarly to how the old registrations are removed from the multicolumn_udfs

• Check for format, and then conditionally perform mitigation change to unregister old UDFs
• Incidental fix to add the injections langkit_data folder to .gitignore so that testing doesn't show up as a change

Tested against the Intro to LangKit notebook example.

[FelipeAdachi]

LGTM!