dsl: allow referencing embedded tosca templates #2004

Job	Run time
test (3.8)	6m 31s
test (3.9)	6m 29s
test (3.10)	6m 13s
test (3.11.0)	6m 29s
test (3.12)	6m 29s
test (3.13)	6m 30s
build py3.${{ matrix.python-version }} on ${{ matrix.platform \|\| matrix.os }} (${{ matrix.alt_arch_name \|\| matrix.arch }})	0s
docs	0s
publish_dockerhub	0s
publish_dockerhub_server	0s
inspect-pypi-assets	0s
publish_dockerhub_nginx	0s
publish_dockerhub_podman	0s
publish_pypi	0s
	38m 41s

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