Set `exclusive_access` to all tests for Kesch

[vkarak]

[teojgo]

The issue can be closed. The only remaining tests are on the private repository. Comments were made at the issues for the individual tests.

[vkarak]

@teojgo Could we have PR in the private repo that sets this flags and fixes the issue completely?

[teojgo]

@vkarak There are individual issues for each of the tests that need to be adapted anyway.

[vkarak]

Ok, we can close this then.