feat: ensure GrpcClient class closure upon deletion (#1417)

Co-authored-by: pyansys-ci-bot <92810346+pyansys-ci-bot@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: 3 people

doc/changelog.d/1417.added.md

@@ -0,0 +1 @@
+ensure GrpcClient class closure upon deletion

src/ansys/geometry/core/connection/client.py

@@ -21,6 +21,7 @@
 # SOFTWARE.
 """Module providing a wrapped abstraction of the gRPC stubs."""
 
+import atexit
 import logging
 from pathlib import Path
 import time
@@ -198,6 +199,10 @@ def __init__(
             LOG.warning("The backend version is only available after 24.1 version.")
             self._backend_version = semver.Version(24, 1, 0)
 
+        # Register the close method to be called at exit - irrespectively of
+        # the user calling it or not...
+        atexit.register(self.close)
+
     @property
     def backend_type(self) -> BackendType:
         """Backend type.
@@ -285,6 +290,10 @@ def close(self):
         deleted. Furthermore, if a local Docker instance
         of the Geometry service was started, it is stopped.
         """
+        if self._closed is True:  # pragma: no cover
+            self.log.debug("Connection is already closed. Ignoring request.")
+            return
+
         if self._remote_instance:
             self._remote_instance.delete()  # pragma: no cover
         elif self._docker_instance: