Arm backend: Make sure we tests correctly with and without Corstone FVP #12108
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Summary
If the elf for running pytest with Corstone FVP exists pytests will pick it up and run with it. This change make sure to remove the elf for the FVP tests if it exists in the none FVP tests before running the tests. As it is (already) build in the FVP versions of the tests, this fix a problem that if you run the test after each other the non FVP tests could find the elf and run on the FVP even if it was not supposed to.
Test plan
GitHub and local verification.
cc @digantdesai @freddan80 @per @oscarandersson8218