Add mTLS settings to ApiClient #1527

Job	Run time
Build Reaper	5m 17s
Docker Image Tests (cassandra, docker)	7m 8s
HTTP Management (binary:4.0.6, ccm, http-api, 1, 1)	23m 41s
Memory backends (binary:3.0.25, local, ccm)	16m 9s
Cassandra backend (binary:3.0.25, cassandra, ccm)	19m 55s
HTTP Management (binary:3.11.16, ccm, http-api, 1, 1)	23m 18s
Cassandra backend (binary:3.11.16, cassandra, ccm)	20m 48s
Memory backends (binary:3.11.16, local, ccm)	18m 30s
Cassandra backend (binary:4.0.6, cassandra, ccm)	24m 18s
Memory backends (binary:4.0.6, local, ccm)	21m 18s
Each DC Availability (binary:4.0.6, cassandra, each, 1, 1)	18m 57s
Flapping reapers (binary:4.0.6, cassandra, ccm, 4, 2, --tags ~@diag_event_subscriptions)	24m 1s
Sidecar (binary:3.0.25, cassandra, sidecar, 1, 1)	14m 55s
Distributed tests (binary:3.0.25, cassandra, ccm, 2, 2)	20m 0s
Distributed tests (binary:3.11.16, cassandra, ccm, 2, 2)	22m 2s
Distributed tests (binary:4.0.6, cassandra, ccm, 2, 2)	24m 26s
Sidecar (binary:3.11.16, cassandra, sidecar, 1, 1)	17m 34s
Sidecar (binary:4.0.6, cassandra, sidecar, 1, 1)	16m 46s
Release Reaper	0s
	5h 39m 3s

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