Add clinvar-ingest per clinvar release Q/A measures to workflow

[toneillbroad]

Add Q/A measures to per ClinVar release ingest. Measures include:

• count of VCVs, SCVs, RCVs, Genes, Submitters, Submissions, etc. pcregrep'd from XML file
• compare those to counts from BQ tables

If counts are off, send a slack messga eindicating the issue.
Create the DO_NOT_PROCESS sentinel file in GCP to stop processing of future clinvar releases until the issue is resolved.

[toneillbroad]

Plan refinement:

1. Pre-parse XML, get counts using JSON path: this is count#1
2. Get counts during parsing from model object creation: this is count#2
3. Validation Get VariationArchive parsing and output to file working with minimal fields #1 - post parse compare count#1 == count#2
4. Post creation of external tables, select count(*) from all external tables: this is count#3
5. Validation Write unit test for simple output created from parsed input, compared to expected output file #2 - compare count#1 == count#3

Add a command line argument to turn validation off for testing purposes.