add more context cancellation check at evaluation time #22

Job	Run time
Build Prometheus for common architectures (0)	6m 37s
Build Prometheus for all architectures	0s
fuzzing	0s
Build Prometheus for common architectures (1)	6m 29s
Build Prometheus for common architectures (2)	6m 26s
Go tests	24m 28s
Go tests with previous Go version	6m 30s
Mixins tests	2m 24s
golangci-lint	3m 4s
UI tests	2m 29s
Go tests on Windows	11m 29s
codeql / Analyze (go)	20m 25s
codeql / Analyze (javascript)	1m 43s
Publish UI on npm Registry	1m 24s
Publish release artefacts	0s
Publish main branch artifacts	0s
	1h 33m 28s

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