only call test.providers when results were not retrieved before

[erwindon]

general alternative for #660 (but not a replacement for it)

[erwindon]

@vkotarov
Can you test this PR to see whether it works also in your case?
We'll discuss further measures in #660, but this is a generic improvement.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[vkotarov]

@erwindon
The thing is that "test.providers" targeting "*" in our environment takes about 85 seconds to complete.
Also, if a user hits the refresh button for some reason, this will have to be executed again, so 85 more seconds time to wait.

[erwindon]

@vkotarov
I know! And that is why the work on #660 will continue. But this one is a general improvement which does not need any configuration. It is an improvement compared to any previous version and it is useful for everyone. See this as a spin-off.
Since it is related to #660, I'm asking you to please look at it and maybe test it in any environment you have available and confirm that it is suitable for the world. thx!