ci: exclude vllm_inference and megatron from nightly recipe CI

vllm_inference: vLLM 0.15.1 requires transformers<5 but the 26.03
container ships transformers 5.x. Excluded until container catches up.

megatron recipes: already run via the dedicated mbridge-recipes workflow
(unit-tests-mbridge-recipes.yaml). Remove duplicate runs from the
recipes workflow to save CI resources.

Both were already excluded from PR changed-files detection. This also
excludes them from scheduled (nightly) ALL_DIRS enumeration.

Signed-off-by: svc-bionemo <267129667+svc-bionemo@users.noreply.github.com>

Author: svc-bionemo

.github/workflows/unit-tests-recipes.yml

@@ -66,7 +66,7 @@ jobs:
           CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
         run: |
           # Get all recipe and model directories
-          ALL_DIRS=$(ls -d bionemo-recipes/models/*/ bionemo-recipes/recipes/*/ 2>/dev/null | jq -R -s -c 'split("\n")[:-1] | map(rtrimstr("/"))')
+          ALL_DIRS=$(ls -d bionemo-recipes/models/*/ bionemo-recipes/recipes/*/ 2>/dev/null | grep -v -E "vllm_inference|megatron" | jq -R -s -c 'split("\n")[:-1] | map(rtrimstr("/"))')
 
           # Helper to check for a PR label
           has_label() {