Implement `discharge capacity` as an optional x-axis in `QuickPlot` #11586

Job	Run time
Example scripts (ubuntu-latest / Python 3.12)	7m 30s
Example notebooks (ubuntu-latest / Python 3.12)	11m 37s
Tests (ubuntu-latest / Python 3.9)	24m 42s
Doctests (ubuntu-latest / Python 3.11)	4m 11s
style	27s
Tests (ubuntu-latest / Python 3.10)	26m 13s
Tests (ubuntu-latest / Python 3.11)	23m 11s
Tests (ubuntu-latest / Python 3.12)	25m 34s
Tests (macos-13 / Python 3.9)	19m 55s
Tests (macos-13 / Python 3.10)	19m 25s
Tests (macos-13 / Python 3.11)	19m 28s
Tests (macos-13 / Python 3.12)	19m 21s
Tests (macos-14 / Python 3.9)	13m 12s
Tests (macos-14 / Python 3.10)	12m 14s
Tests (macos-14 / Python 3.11)	10m 18s
Tests (macos-14 / Python 3.12)	8m 48s
Tests (windows-latest / Python 3.9)	38m 7s
Tests (windows-latest / Python 3.10)	29m 56s
Tests (windows-latest / Python 3.11)	26m 4s
Tests (windows-latest / Python 3.12)	22m 36s
	6h 2m 49s

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