dynvar: allow trailing underscores in reference path segments

.nextchanges/bundles/6711.md

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+* `${resources...}` references to a resource key ending in an underscore (e.g. `my_job_`) now resolve instead of being silently dropped. ([#6711](https://github.com/databricks/cli/pull/6711))

acceptance/bundle/resource_deps/trailing_underscore_key_reference/databricks.yml

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+bundle:
+  name: test-bundle
+
+# A job resource key ending in an underscore (e.g. producer_) is a valid, deployable
+# key, and ${resources.jobs.producer_.id} now resolves like any other reference. The
+# reference regex (libs/dyn/dynvar/ref.go) allows trailing underscores (but not a
+# trailing hyphen). Before the fix the reference was silently dropped with a warning
+# and run_job_task ended up without a job_id.
+resources:
+  jobs:
+    producer_:
+      name: producer
+    consumer:
+      name: consumer
+      tasks:
+        - task_key: run_producer
+          run_job_task:
+            job_id: ${resources.jobs.producer_.id}

acceptance/bundle/resource_deps/trailing_underscore_key_reference/output.txt

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+
+>>> [CLI] bundle validate
+Name: test-bundle
+Target: default
+Workspace:
+  User: [USERNAME]
+  Path: /Workspace/Users/[USERNAME]/.bundle/test-bundle/default
+
+Validation OK!
+
+>>> [CLI] bundle validate --output json
+[
+  {
+    "run_job_task": {
+      "job_id": "${resources.jobs.producer_.id}"
+    },
+    "task_key": "run_producer"
+  }
+]

acceptance/bundle/resource_deps/trailing_underscore_key_reference/script

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+trace $CLI bundle validate
+trace $CLI bundle validate --output json | jq '.resources.jobs.consumer.tasks'

acceptance/bundle/resource_deps/trailing_underscore_key_reference/test.toml

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+RecordRequests = false