Fix configuration of LbExec tests

accidentally I noticed a couple of issues with the tests of LbExec:

• the exclusions workaround in pytest.ini works only if the build directory is inside the project directory
• pytest.ini is installed in InstallArea/python

After fixing the configuration of the test I realized that one of the tests creates a file in the "current directory", so I modified the test so that the file is created in a temporary directory although I believe the file should not be created at all (and the test should check that it is the case).

assigned to @cburr

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• 7066548e - Fix configuration of LbExec tests

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added 21 commits

• 7066548e...c1a7ca1c - 19 commits from branch master
• c3d003c7 - Fix configuration of LbExec tests
• a22b5f50 - Only create output file from "lbexec --export" if it doesn't fail

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/ci-test

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• [2022-07-12 15:19] Validation started with lhcb-master-mr#5003

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mentioned in commit afc88d6e

For reference - related to DPA task https://gitlab.cern.ch/lhcb-dpa/project/-/issues/180.

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