Starting single integration test by gradle inside IDE does not use developer settings

[de-jcup]

Situation

With

• IDE gradle builds cannot start single integration tests or manual tests #3829

it became clear that the filtering of integration tests is a problem for local IDE gradle based exeuction of tests.

While fixing it, another problem appeared:

~/.sechub/sechub-developer.properties
containing:
sechub.integrationtest.running=true

were still skipped after the fix.

Analyze

The reason is, that the files are not fetched in case of gradle builds, means also local gradle builds.
This comes very inconvenient and is also extreme confusing.

Wanted

A gradle build shall search for the ~/.sechub/sechub-developer.properties as well.
If its not existing, nothing shall happen.

Solution

Remove the special gradle handling