Fixing text/null variants that should have been otherwise

[theferrit32]

There were previously some CNVs that should have been normalized to CNV instead of Text given current capabilities of the normalization service.

Some will remain as Text until these are resolved:

• definite range CopyNumberCounts
  • Normalize copy number counts with a range for the number of copies #707
• copy numbers with one endpoint being a range and the other being a number
  • Error thrown on asymmetric single number/range intervals cancervariants/variation-normalization#417

Resolves #748

Touches #698

[theferrit32]

Closing as Obsolete. We have extracted the variation transformation code into a separate repo here: https://github.com/clingen-data-model/clinvar-gk-pilot

When we come back to this we can take a look at if any code can be lifted over, but I think we want to minimize interaction with the normalization service and instead go through the native python library.