dynvar: fix references to resource keys with trailing underscores

.nextchanges/bundles/reference-trailing-underscore-resource-keys.md

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+* Fix `${resources...}` references to resource keys ending in an underscore (e.g. `my_job_`). Deploying such a resource with `permissions` or `grants` failed with `cannot parse "/jobs/${resources.jobs.my_job_.id}"`, which also made the automatic migration of Terraform-deployed bundles fail. ([#6965](https://github.com/databricks/cli/pull/6965))

acceptance/bundle/resource_deps/trailing_underscore_key_reference/databricks.yml

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+bundle:
+  name: test-bundle
+
+# Reproduce: resource keys with a trailing underscore caused "cannot parse" on the
+# direct engine because the reference regex required segments to end with a letter or digit.
+resources:
+  jobs:
+    job_:
+      name: trailing underscore
+      permissions:
+        - level: CAN_VIEW
+          group_name: users
+    _job__:
+      name: leading and trailing underscores
+    ref:
+      name: "a=${resources.jobs.job_.id} b=${resources.jobs._job__.id}"

acceptance/bundle/resource_deps/trailing_underscore_key_reference/out.test.toml

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+Cloud = false
+EnvMatrix.DMS = ["", "true"]

acceptance/bundle/resource_deps/trailing_underscore_key_reference/output.txt

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+
+>>> [CLI] bundle deploy
+Uploading bundle files to /Workspace/Users/[USERNAME]/.bundle/test-bundle/default/files...
+Created jobs._job__
+Created jobs.job_
+Created jobs.job_.permissions
+Created jobs.ref
+Files: 1 uploaded, 0 deleted
+Resources: 4 created, 0 changed, 0 deleted, 0 unchanged

acceptance/bundle/resource_deps/trailing_underscore_key_reference/script

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+trace $CLI bundle deploy

acceptance/bundle/resource_deps/trailing_underscore_key_reference/test.toml

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+RecordRequests = false