Arm backend: Backend test call setup_path.sh

[zingo]

Summary

This is needed so that the installed FVP can be used from backed tests.
This also add related files to the backed tests trigger script

Test plan

Arm Backend tests suite

cc @freddan80 @per @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14846

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❌ 2 New Failures

As of commit 1c4106a with merge base 0b748bf ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7cc225d4f7f0597c1bce4010c0fe3e5deaabf42c76e19bc82eafb887da6585bb /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

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