feat(cli): save default agent token to local config (#4050) #6621

Job	Run time
Build docker image	5m 51s
Agent unit tests	1m 8s
CLI unit tests	30s
API Server unit tests	3m 45s
WebUI unit tests	2m 9s
config-e2e	1s
CLI smoke tests (local)	39s
Test examples (collector)	41s
CLI smoke tests (docker)	46s
Tracetesting API Server (InMemory)	3m 51s
Test examples (tracetest-jaeger)	39s
Tracetesting API Server (NATS)	8m 38s
Test examples (tracetest-opensearch)	12m 39s
Test examples (tracetest-tempo)	43s
Test examples (tracetest-provisioning-env)	43s
WebUI End-to-end tests (1)	5m 58s
CLI e2e tests (8, 0)	1m 30s
WebUI End-to-end tests (2)	3m 41s
CLI e2e tests (8, 1)	1m 20s
WebUI End-to-end tests (3)	3m 22s
CLI e2e tests (8, 2)	1m 20s
WebUI End-to-end tests (4)	3m 24s
CLI e2e tests (8, 3)	1m 24s
WebUI End-to-end tests (5)	5m 28s
CLI e2e tests (8, 4)	1m 22s
WebUI End-to-end tests (6)	3m 14s
CLI e2e tests (8, 5)	5m 40s
WebUI End-to-end tests (7)	3m 20s
CLI e2e tests (8, 6)	1m 27s
WebUI End-to-end tests (8)	3m 18s
CLI e2e tests (8, 7)	5m 49s
	1h 34m 20s

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