tests: add tests for CT parse failures and deepCopy #70

Job	Run time
Check generated parser	10s
Build Prometheus for all architectures	0s
Build Prometheus for common architectures (0)	6m 27s
fuzzing	0s
Build Prometheus for common architectures (1)	6m 27s
golangci-lint	25s
Build Prometheus for common architectures (2)	5m 59s
Go tests	16m 45s
More Go tests	5m 3s
Go tests with previous Go version	7m 20s
Mixins tests	2m 12s
UI tests	2m 32s
Go tests on Windows	11m 18s
codeql / Analyze (javascript)	1m 24s
Publish UI on npm Registry	1m 27s
Publish main branch artifacts	0s
Publish release artefacts	0s
	1h 7m 29s

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