Change wording on "release tested in ENV"

[mmazur]

Currently it says "first tested". This is incorrect for the prod environment, since it's quite possible that a particular release was first tested in int, but the code doesn't actually check that, it only checks for whether testing in ENV happened in ENV-1.

Which is why I've corrected the wording of the message slightly to be less ambiguous.

[openshift-ci]

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[mmazur]

/retest

[openshift-ci]

@mmazur: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/unit	0db3f26	link	true	/test unit

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