test: fix intermittent operator metrics test failure #20686

Job	Run time
Get changed files	6s
argoexec-image	29s
Lint	3m 55s
Windows Unit Tests	10m 6s
Unit Tests	4m 27s
Codegen	0s
UI	0s
E2E Tests (test-executor, minimal)	13m 46s
E2E Tests (test-corefunctional, minimal)	13m 20s
E2E Tests (test-functional, minimal)	19m 12s
E2E Tests (test-api, mysql)	7m 11s
E2E Tests (test-cli, mysql)	11m 9s
E2E Tests (test-cron, minimal)	6m 21s
E2E Tests (test-examples, minimal)	5m 56s
E2E Tests (test-plugins, plugins)	3m 45s
E2E Tests (test-java-sdk, minimal)	3m 33s
E2E Tests (test-python-sdk, minimal)	4m 1s
E2E Tests (test-executor, v1.25.11-k3s1, minimal)	13m 31s
E2E Tests (test-corefunctional, v1.25.11-k3s1, minimal)	13m 8s
E2E Tests (test-functional, v1.25.11-k3s1, minimal)	19m 29s
E2E Tests - Composite result	1s
	2h 33m 26s

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