Add `total` to `#let`-bindings where LHS is a variable #3480

Job	Run time
Version Sync	11s
Check Java code formatting	30s
K Ubuntu Jammy Package	24m 7s
K Tests	28m 18s
Nix: Maven	38s
Nix flake (self-hosted, linux, normal)	2m 0s
Nix flake (macos-13, macos-13)	15m 50s
Nix flake (MacM1, self-macos-12)	23m 21s
Performace Tests	13m 20s
	1h 48m 15s

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