FW should complain on non-existing application properties file

[rsvoboda]

I had code that was backported from main to 3.8 branch. The testing app used property file that was introduced in one of the previous PRs. That PR was not selected for backport and thus the property file did,t exist in 3.8 branch.

There was no complain about non-existing property file when he application was started

    @QuarkusApplication(classes = { DownloadResource.class }, properties = "non-existing.properties")
    static RestService app = new RestService();

FW should complain on non-existing application properties file and maybe fail the tests quickly / throw error.

Trigger: quarkus-qe/quarkus-test-suite#1971 (comment)