Free up space on github actions runners for all jobs. #2691

Job	Run time
Validate script WDLs using womtools	31s
build and push gatk docker to artifacts	3s
Validate generated WDLs using womtools	25s
check if the environment has privileges	1s
WDL test RUN_CNV_GERMLINE_COHORT_WDL on cromwell	22s
WDL test RUN_CNV_GERMLINE_CASE_WDL on cromwell	29s
WDL test RUN_CNV_SOMATIC_WDL on cromwell	26s
WDL test RUN_M2_WDL on cromwell	28s
WDL test RUN_CNN_WDL on cromwell	29s
WDL test RUN_VCF_SITE_LEVEL_FILTERING_WDL on cromwell	30s
Java 17.0.6+10 build and test cloud	42s
Java 17.0.6+10 build and test integration	49s
Java 17.0.6+10 build and test unit	40s
Java ${{ matrix.Java }} test on docker ${{ matrix.testType }}	0s
	5m 55s

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