Implement ButtonIcon and achieve parity with Button/Toggle widgets #8651

Job	Run time
Setup workflow	5s
Run pre-commit	17s
Core tests on Python 3.12, ubuntu-latest	5m 10s
UI tests on ubuntu-latest with Python 3.9	13m 37s
UI tests on macos-latest with Python 3.9	18m 7s
UI tests on windows-latest with Python 3.9	22m 22s
Unit tests on ubuntu-latest with Python 3.9	7m 45s
Unit tests on ubuntu-latest with Python 3.11	7m 23s
Unit tests on macos-latest with Python 3.9	15m 25s
Unit tests on macos-latest with Python 3.11	18m 1s
Unit tests on windows-latest with Python 3.9	22m 59s
Unit tests on windows-latest with Python 3.11	20m 42s
Unit tests on ubuntu-latest with Python 3.10	7m 59s
	2h 39m 52s

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