feat: Add GitHub Actions workflow to notify Letta Cloud on main branch pushes #5737

Job	Run time
unit-run (test_vector_embeddings.py)	44s
unit-run (test_client.py)	6m 50s
unit-run (test_client_legacy.py)	2m 16s
unit-run (test_server.py)	1m 8s
unit-run (test_v1_routes.py)	43s
unit-run (test_local_client.py)	55s
unit-run (test_managers.py)	1m 16s
unit-run (test_base_functions.py)	59s
unit-run (test_tool_schema_parsing.py)	2m 23s
unit-run (test_tool_rule_solver.py)	43s
unit-run (test_memory.py)	50s
unit-run (test_utils.py)	50s
unit-run (test_stream_buffer_readers.py)	41s
	20m 18s

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