test: fix e2e testcase selection

[bermuell]

Description

In e2e tests the selection of a test case with specific test config did not work as specified ("-tc testcase::testconfig").
Also when running multiple test case the TestRunner where referencing a TestTarget, instead of having it's own instance, which caused side effects.
Fix will provide each test runner it's own target instance.

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[MSalopek]

Approve.

Could you please elaborate in the PR description what was done or here the issue originated from.