test(discovery): validate context cancellation for ReverseDNS

[mendsec]

Added TestReverseDNSCancellationActive to pkg/discovery/net_test.go to verify that ReverseDNS does not leak goroutines during early cancellation. Checked by taking a baseline of goroutines before running ReverseDNS and ensuring that it returns to within a threshold of <= 3 after the background context cancels.

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PR created automatically by Jules for task 9384047681915600896 started by @mendsec

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[codacy-production]

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