Retry the GATK_VARIANT_RECALIBRATOR with reduced gaussians on failure

[abhi18av]

3 annotations (DP/...) work with 4 gaussians

GATK_VARIANT_RECALIBRATOR
--max-gaussians 

Always reduce the value from 4

[TORCH-UAntwerpen]

Write a bash wrapper script around GATK which runs GATK variant recalibrator and if it fails check the error log of std log to see if the 'failed to converge' line is there. If it is, just have the bash script exit with exitcode 0 (i.e. successful) and write some bad vlod score so the pipeline doesnt pick the recalibartion that failed.

[abhi18av]

As a back, we solve this via documentation warning.