Tests

Add `test_config_parameters` test #2092

Job	Run time
Unit test charm	34s
Lint / Lint .github/workflows/	8s
Lint / tox run -e lint	25s
Build charm / Get workflow version / Get workflow version	11s
Build charm / Collect bases for charm \| .	22s
Build charm / Build charm \| base #0	4m 49s
Integration test charm \| ${{ matrix.juju.agent }}	0s
	6m 29s

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