Set a MockSession context for the initial execution of express code #3066

Job	Run time
playwright-examples (3.11, ubuntu-latest)	9m 9s
build (3.11, ubuntu-latest)	2m 2s
playwright-deploys	0s
playwright-examples (3.10, ubuntu-latest)	8m 59s
build (3.11, windows-latest)	2m 6s
playwright-examples (3.9, ubuntu-latest)	2m 22s
build (3.11, macOS-latest)	2m 0s
playwright-examples (3.8, ubuntu-latest)	2m 3s
build (3.10, ubuntu-latest)	2m 5s
playwright-shiny (3.11, ubuntu-latest)	8m 54s
build (3.10, windows-latest)	2m 14s
build (3.10, macOS-latest)	2m 2s
playwright-shiny (3.10, ubuntu-latest)	8m 57s
playwright-shiny (3.9, ubuntu-latest)	2m 2s
build (3.9, ubuntu-latest)	2m 0s
playwright-shiny (3.8, ubuntu-latest)	1m 51s
build (3.9, windows-latest)	1m 58s
build (3.9, macOS-latest)	2m 4s
testrail-reporting-nightly	0s
build (3.8, ubuntu-latest)	1m 55s
build (3.8, windows-latest)	1m 47s
build (3.8, macOS-latest)	1m 53s
Deploy to PyPI	0s
	1h 8m 23s

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