Reverting the CombineGVCFs and GenotypeGVCFs to the old behavior for no-calls when there are no PLs present.

[jamesemery]

Initial check-in to find test failures.

Adresses #8328

[gatk-bot]

Github actions tests reported job failures from actions build 7891988613 Failures in the following jobs:

Test Type	JDK	Job ID	Logs
integration	17.0.6+10	7891988613.11	logs
integration	17.0.6+10	7891988613.0	logs

[gatk-bot]

Github actions tests reported job failures from actions build 7905273867 Failures in the following jobs:

Test Type	JDK	Job ID	Logs
integration	17.0.6+10	7905273867.11	logs
integration	17.0.6+10	7905273867.0	logs

[droazen]

A different series of PRs was already merged to return us to the old GenotypeGVCFs no-call behavior. This PR is obsolete.