fix(layer): layer reference now reacts to layersChanged signal to unset reference when a layer is deleted #1155

Job	Run time
client (ubuntu-latest)	35s
client (windows-latest)	35s
docs	1m 0s
ngauth (ubuntu-latest)	20s
client (macos-latest)	33s
python-build-package (ubuntu-latest, *, linux)	30s
wasm (ubuntu-latest)	1m 26s
python-tests (3.9, ubuntu-latest)	7m 30s
python-build-package (windows-latest, *, windows)	30s
python-tests (3.9, windows-latest)	4m 13s
python-tests (3.9, macos-latest)	2m 0s
python-build-package (macos-14, *_x86_64, macos_x86_64)	44s
python-tests (3.12, ubuntu-latest)	6m 3s
python-tests (3.12, windows-latest)	5m 27s
python-build-package (macos-14, *_arm64, macos_arm64)	37s
python-tests (3.12, macos-latest)	2m 52s
publish-package	0s
	34m 55s

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