Include demos when running integration tests on CI

[stefanhaller]

• PR Description

This includes the demos when using make integration-test-all, and speeds them up a little bit when run in this way by disabling Wait calls when running in headless mode.

This will guard against demos breaking when we make behavior changes, as happened several times in the past (most recently in #3636.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 187a2f01	✅ 71.43%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (187a2f0)	Report Missing	Report Missing	Report Missing
Head commit (f532944)	51749	44693	86.36%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3640)	7	5	71.43%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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Footnotes

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[jesseduffield]

Nice one