Replace LRConvertBCF workflow with a more efficient and up-to-date solution

[bshifaw]

The current LRConvertBCF workflow, is used to convert a BCF file into a compressed VCF file, and is intended as a temporary solution to handle transient issues. It needs to be replaced with a more efficient and up-to-date solution.

Once the replacement workflow is created, the LRConvertBCF workflow should be removed, and the associated documentation and tests should be updated.

Originally posted by @SHuang-Broad in https://github.com/broadinstitute/long-read-pipelines/pull/392#discussion_r1158976924