Set PREFECT_API_URL correctly during tests #13523

Job	Run time
Detect which file has changed	5s
javascript-lint	6s
action-lint	0s
helm-lint	0s
infrahub-poetry-check	0s
markdown-lint	0s
yaml-lint	0s
python-lint	11s
frontend-tests	0s
backend-tests-functional	6m 57s
backend-tests-unit	12m 31s
backend-tests-integration	14m 5s
backend-benchmark	5m 14s
backend-validate-generated	35s
documentation	0s
E2E-testing-invoke-demo-start	0s
E2E-testing-playwright	11m 18s
validate-generated-documentation	1m 26s
validate-documentation-style	0s
validate-release-notes-style	0s
E2E-testing-version-upgrade / From 1.0.0	8m 6s
coverall-report	3s
	1h 0m 37s

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