Add brand selection to support additional brands who use the same API for...

Add brand selection to support additional brands who use the same API for AquaCell integration (#121817)

* Support harvey brand

* Update tests

* Moved the brand selection step to the same step as credentials

* Update tests/components/aquacell/test_init.py

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Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>