Tests

fix: copy initials to `u0` if `u0` not provided to `remake` #1747

Job	Run time
Tests (1, Downstream) / Tests - Downstream	26m 21s
Tests (1, Extended) / Tests - Extended	20m 19s
Tests (1, Extensions) / Tests - Extensions	42m 40s
Tests (1, FMI) / Tests - FMI	25m 8s
Tests (1, Initialization) / Tests - Initialization	29m 22s
Tests (1, InterfaceI) / Tests - InterfaceI	36m 12s
Tests (1, InterfaceII) / Tests - InterfaceII	40m 35s
Tests (1, RegressionI) / Tests - RegressionI	15m 43s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	20m 45s
Tests (lts, Downstream) / Tests - Downstream	16m 31s
Tests (lts, Extended) / Tests - Extended	11m 12s
Tests (lts, Extensions) / Tests - Extensions	25m 13s
Tests (lts, FMI) / Tests - FMI	17m 12s
Tests (lts, Initialization) / Tests - Initialization	21m 3s
Tests (lts, InterfaceI) / Tests - InterfaceI	27m 24s
Tests (lts, RegressionI) / Tests - RegressionI	7m 44s
Tests (lts, InterfaceII) / Tests - InterfaceII	37m 7s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 50s
Tests (pre, Downstream) / Tests - Downstream	30m 17s
Tests (pre, Extended) / Tests - Extended	22m 40s
Tests (pre, Extensions) / Tests - Extensions	1h 44m 50s
Tests (pre, FMI) / Tests - FMI	28m 58s
Tests (pre, Initialization) / Tests - Initialization	36m 53s
Tests (pre, InterfaceI) / Tests - InterfaceI	42m 18s
Tests (pre, InterfaceII) / Tests - InterfaceII	48m 29s
Tests (pre, RegressionI) / Tests - RegressionI	18m 55s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	23m 20s
	13h 9m 1s

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