bundlereader: merge PROXY_CA_BUNDLE into CABundle for HTTPS git clones #8347

Job	Run time
e2e-fleet-test-k3s-new-metrics	10m 51s
e2e-fleet-test-k3s-new-sharding	5m 29s
e2e-fleet-test-k3s-old-sharded-metrics	10m 10s
e2e-fleet-test-k3s-old-infra-setup-git	20m 52s
e2e-fleet-test-k3s-new-sharded-metrics	9m 57s
e2e-fleet-test-k3s-old-default	11m 49s
e2e-fleet-test-k3s-new-default	12m 44s
e2e-fleet-test-k3s-old-infra-setup-oci	12m 14s
e2e-fleet-test-k3s-old-infra-setup-helm	5m 52s
e2e-fleet-test-k3s-old-sharding	5m 32s
e2e-fleet-test-k3s-old-metrics	10m 10s
e2e-fleet-test-k3s-new-infra-setup-oci	12m 20s
e2e-fleet-test-k3s-new-infra-setup-git	19m 16s
e2e-fleet-test-k3s-new-infra-setup-helm	6m 29s
	2h 33m 45s

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