fix: Add identifiable user agent in API client. Fixes #11996 (#12276) #19323

Job	Run time
argoexec-image	2m 42s
Get changed files	5s
Unit Tests	4m 20s
Windows Unit Tests	11m 44s
Codegen	4m 35s
Lint	3m 34s
UI	0s
E2E Tests (test-executor, minimal)	11m 20s
E2E Tests (test-corefunctional, minimal)	12m 17s
E2E Tests (test-functional, minimal)	19m 47s
E2E Tests (test-api, mysql)	6m 9s
E2E Tests (test-cli, mysql)	11m 52s
E2E Tests (test-cron, minimal)	7m 5s
E2E Tests (test-examples, minimal)	5m 57s
E2E Tests (test-plugins, plugins)	3m 55s
E2E Tests (test-java-sdk, minimal)	3m 29s
E2E Tests (test-python-sdk, minimal)	3m 7s
E2E Tests (test-executor, v1.25.11-k3s1, minimal)	11m 34s
E2E Tests (test-corefunctional, v1.25.11-k3s1, minimal)	12m 31s
E2E Tests (test-functional, v1.25.11-k3s1, minimal)	19m 38s
E2E Tests - Composite result	1s
	2h 35m 42s

Provide feedback