Reduce multiple calls to calculate sensor unit in tplink #209041

Job	Run time
Collect information & changes data	14s
Prepare pre-commit base	13s
Prepare dependencies (3.12)	12s
Check other linters	29s
Check ruff	18s
Check ruff-format	14s
Check all requirements	25s
Check pylint	24s
Check hassfest	47s
Audit licenses	0s
Check mypy	33s
Check pylint on tests	30s
Split tests for full run	0s
Run tests Python 3.12 (tplink)	1m 26s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	0s
Run ${{ matrix.mariadb-group }} tests Python ${{ matrix.python-version }}	0s
Run ${{ matrix.postgresql-group }} tests Python ${{ matrix.python-version }}	0s
Upload test coverage to Codecov (full suite)	0s
Upload test coverage to Codecov (partial suite)	19s
	6m 4s

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