fix: testing environment config file ignored and needlessly wait for timeout

[mtorromeo]

What was changed

Changed Temporal\Testing\Environment::startRoadRunner to actually use the $configFile parameter and to not wait for timeout if the process is not running.

Why?

1. In Temporal\Testing\Environment the startRoadRunner has a $configFile parameter, which is also passed through the start method's $roadRunnerConfigFile parameter but that is completely ignored.

2. In startRoadRunner if the executed process crashes/exists before $commandTimeout triggers (which is 10 seconds by default but could also be much longer) then the function will wait needlessly for the timeout while it could return right away.

Checklist

Confirmed by testing it on my own project, also with a misconfigured command that does not start correctly.

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[mtorromeo]

I forgot to add that there was a third fix in the PR.

If startRoadrunner is passed a custom $rrCommand this is currently used correctly to start the serve process but the "check" loop still calls [$this->systemInfo->rrExecutable, 'workers', ...].

The proposed solution is to use $rrCommand by replacing the serve argument with workers.

I just separated the commit for easier review.

[mtorromeo]

I would also like to point out that in my opinion the classes in this SDK seem to be declared as final a bit too often, and while sometimes it is indeed a good call, other times I don't see any reason to do so.

Temporal\Testing\Environment is one such case where I don't understand why this needs to be final, as I could have easily extended the class to implement my own startRoadRunner logic.