Tests

fix: `@mtkmodel` no longer makes `@variables` callable #827

Job	Run time
Tests (1, Downstream) / Tests - Downstream	12m 48s
Tests (1, Extended) / Tests - Extended	10m 36s
Tests (1, Extensions) / Tests - Extensions	25m 16s
Tests (1, InterfaceI) / Tests - InterfaceI	31m 39s
Tests (1, InterfaceII) / Tests - InterfaceII	20m 15s
Tests (1, RegressionI) / Tests - RegressionI	10m 3s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 38s
Tests (lts, Downstream) / Tests - Downstream	8m 7s
Tests (lts, Extended) / Tests - Extended	7m 49s
Tests (lts, Extensions) / Tests - Extensions	17m 20s
Tests (lts, InterfaceI) / Tests - InterfaceI	25m 15s
Tests (lts, InterfaceII) / Tests - InterfaceII	15m 6s
Tests (lts, RegressionI) / Tests - RegressionI	4m 49s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	8m 9s
Tests (pre, Downstream) / Tests - Downstream	12m 15s
Tests (pre, Extended) / Tests - Extended	10m 59s
Tests (pre, Extensions) / Tests - Extensions	24m 1s
Tests (pre, InterfaceII) / Tests - InterfaceII	13m 23s
Tests (pre, InterfaceI) / Tests - InterfaceI	25m 1s
Tests (pre, RegressionI) / Tests - RegressionI	1m 8s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	5m 25s
	5h 1m 2s

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