msau42: Remove 1.16 csi jobs and add 1.19 optional jobs

JobBuild
19280
09-19 01:48
pull-test-infra-bazel 1308047463013158912 1307134187190358016
pull-test-infra-gubernator 1308047463042519040 1307134187211329536
pull-test-infra-prow-checkconfig 1308047463143182336 1307134187274244096
pull-test-infra-verify-file-perms 1308047463071879168 1307134187232301056
pull-test-infra-yamllint 1308047463113822208 1307134187253272576