Fix duplicate CDI spec generation in jit-cdi mode

[elezar]

Fixes #1429

As a proxy for this we can use a duplicate cuda compat ld.so.conf.d file as seen in:
https://github.com/NVIDIA/nvidia-container-toolkit/actions/runs/19136472132/job/54690347765?pr=1431

docker when Testing CUDA Forward compatibility [It] should create a single ld.so.conf.d config file
/home/runner/_work/nvidia-container-toolkit/nvidia-container-toolkit/tests/e2e/nvidia-container-toolkit_test.go:202
  [FAILED] Expected
      <[]string | len:3, cap:3>: [
          "-rw-r--r-- 1 root root 28 Nov  6 13:16 /etc/ld.so.conf.d/00-compat-3060868491.conf",
          "-rw-r--r-- 1 root root 28 Nov  6 13:16 /etc/ld.so.conf.d/00-compat-3160397803.conf",
          "",
      ]
  to have length 1
  In [It] at: /home/runner/_work/nvidia-container-toolkit/nvidia-container-toolkit/tests/e2e/nvidia-container-toolkit_test.go:205 @ 11/06/25 08:16:49.078

[elezar]

/cherry-pick release-1.18

[ArangoGutierrez]

lgtm

[github-actions]

🤖 Backport PR created for release-1.18: #1445 ✅