Fix repeated fused stencil test

[stelliom]

This PR fixes the test_directive_semantics_validation_repeated_stencil test in test_validation.py. This test was not actually testing repeated stencils, since the names of the stencils provided in the arguments were not the same, probably this was overlooked during the recent name changes of stencils.

Additionally, fixing the above issue uncovered another problem that was not previously spotted due to this test being faulty. Repeated fused stencils were not actually supported, so here we also add support for them.

Note: we also added a small change in validation.py to change a string to a raw string, in order to avoid a warning about an invalid escape sequence.

[github-actions]

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[stelliom]

cscs-ci run default

[stelliom]

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[muellch]

So we support repeated fused stencils now, is this also tested anywhere?

[stelliom]

So, this was already "tested" in tools/tests/liskov/test_generation.py therefore I thought you always actually wanted to support repeated fused stencils, otherwise why test it (at least why test it the way it was)?

If you look at my changes you can see that I also change/fix exactly that test, which in the end is the same as for repeated stencils, but just a different argument.