Remove unused fixture from LCN tests #231111

# to view logs

Job	Run time
Collect information & changes data	14s
Prepare dependencies (3.12)	22s
Prepare pre-commit base	14s
Prepare dependencies (3.13)	30s
Check Dockerfile	16s
Check Dockerfile.dev	12s
Check script/hassfest/docker/Dockerfile	11s
Check ruff	12s
Check ruff-format	10s
Check other linters	35s
Check all requirements	27s
Check hassfest	1m 13s
Audit licenses	0s
Check pylint	26s
Check pylint on tests	28s
Check mypy	25s
Split tests for full run	0s
Run tests Python 3.12 (lcn)	1m 15s
Run ${{ matrix.postgresql-group }} tests Python ${{ matrix.python-version }}	0s
Run ${{ matrix.mariadb-group }} tests Python ${{ matrix.python-version }}	0s
Run tests Python 3.13 (lcn)	2m 53s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	0s
Upload test coverage to Codecov (full suite)	0s
Upload test coverage to Codecov (partial suite)	18s
	10m 21s

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