Remove brittle regex test for file content

These values tend to change with minor changes in the input data or tool
versions, and are overly hard to read due to the use of regular expressions.
For now, we only check the file content to make sure the headers haven't
changes.
8 jobs for gsnap in 11 seconds (queued for 195 minutes and 53 seconds)
Status Job ID Name Coverage
  Sanity
failed #8920
slurm
test_sanity

00:00:11

 
  Dry Run
skipped #8921
slurm
test_dry_run
 
  Integration
skipped #8924
slurm
expression
skipped #8925
slurm
fusion
skipped #8926
slurm
itd
skipped #8922
slurm
qc_seq
skipped #8923
slurm
snv_indels
 
  Report
skipped #8927
slurm
hamlet_report
 
Name Stage Failure
failed
test_sanity Sanity
No job log