Add bcftools validation tests for error conditions

[tomwhite]

Ideally we would match the error text - we could at least do an approximate match, or look for key phrases.

$ bcftools view -i 'INFO/DP > 10' -e 'INFO/DP < 50' ./tests/data/vcf/sample.vcf.gz
Error: only one -i or -e expression can be given, and they cannot be combined

vs

vcztools view -i 'INFO/DP > 10' -e 'INFO/DP < 50' ./vcz_test_cache/sample.vcf.vcz
##fileformat=VCFv4.0
##FILTER=<ID=PASS,Description="All filters passed">
##fileDate=20090805
##source=myImputationProgramV3.1
##reference=1000GenomesPilot-NCBI36
##phasing=partial
##INFO=<ID=NS,Number=1,Type=Integer,Description="Number of Samples With Data">
##INFO=<ID=AN,Number=1,Type=Integer,Description="Total number of alleles in called genotypes">
##INFO=<ID=AC,Number=.,Type=Integer,Description="Allele count in genotypes, for each ALT allele, in the same order as listed">
##INFO=<ID=DP,Number=1,Type=Integer,Description="Total Depth">
##INFO=<ID=AF,Number=.,Type=Float,Description="Allele Frequency">
##INFO=<ID=AA,Number=1,Type=String,Description="Ancestral Allele">
##INFO=<ID=DB,Number=0,Type=Flag,Description="dbSNP membership, build 129">
##INFO=<ID=H2,Number=0,Type=Flag,Description="HapMap2 membership">
##FILTER=<ID=s50,Description="Less than 50% of samples have data">
##FILTER=<ID=q10,Description="Quality below 10">
##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
##FORMAT=<ID=GQ,Number=1,Type=Integer,Description="Genotype Quality">
##FORMAT=<ID=DP,Number=1,Type=Integer,Description="Read Depth">
##FORMAT=<ID=HQ,Number=2,Type=Integer,Description="Haplotype Quality">
##ALT=<ID=DEL:ME:ALU,Description="Deletion of ALU element">
##ALT=<ID=CNV,Description="Copy number variable region">
##contig=<ID=19>
##contig=<ID=20>
##contig=<ID=X>
##vcztools_viewCommand=view -i INFO/DP > 10 -e INFO/DP < 50 ./vcz_test_cache/sample.vcf.vcz; Date=2025-02-10 17:33:36.255776
#CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO	FORMAT	NA00001	NA00002	NA00003
Traceback (most recent call last):
  File "/Users/tom/miniforge3/envs/vcztools-3.11-m1/bin/vcztools", line 8, in <module>
    sys.exit(vcztools_main())
             ^^^^^^^^^^^^^^^
  File "/Users/tom/miniforge3/envs/vcztools-3.11-m1/lib/python3.11/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/tom/miniforge3/envs/vcztools-3.11-m1/lib/python3.11/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/Users/tom/miniforge3/envs/vcztools-3.11-m1/lib/python3.11/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/tom/miniforge3/envs/vcztools-3.11-m1/lib/python3.11/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/tom/miniforge3/envs/vcztools-3.11-m1/lib/python3.11/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/tom/workspace/vcztools/vcztools/cli.py", line 219, in view
    vcf_writer.write_vcf(
  File "/Users/tom/workspace/vcztools/vcztools/vcf_writer.py", line 178, in write_vcf
    raise ValueError(
ValueError: Cannot handle both an include expression and an exclude expression.

There are a couple of things wrong with the vcztools output here: there shouldn't be a VCF header, and we should just print an error, not a stacktrace.

#117 is related