obuild-worker: extract workerClientErrorFrom() helper and add tests #16551

Job	Run time
🔍 Check for valid snapshot urls	44s
🔍 Check for valid snapshot urls	45s
🧹 cloud-cleaner-is-enabled	3s
🧹 cloud-cleaner-is-enabled	3s
🔍 Check for missing or unused runner repos	14s
🔍 Check for missing or unused runner repos	14s
🗄 DB tests	1m 2s
🗄 DB tests	1m 2s
Gitlab CI trigger helper	4s
Gitlab CI trigger helper	4s
⌨ Golang Lint	2m 43s
⌨ Golang Lint	2m 43s
🎀 kube-linter	19s
🎀 kube-linter	19s
📦 Packit config lint	43s
📦 Packit config lint	43s
🔍 Check source preparation	1m 6s
🔍 Check source preparation	1m 6s
🐍 Lint python scripts	39s
🐍 Lint python scripts	39s
📦 RPMlint	53s
📦 RPMlint	53s
🐚 Shellcheck	22s
🐚 Shellcheck	22s
🛃 Unit tests	3m 19s
🛃 Unit tests	3m 19s
	24m 23s

Provide feedback