Add `total` to `#let`-bindings where LHS is a variable #3483

Job	Run time
Version Sync	11s
Check Java code formatting	20s
K Ubuntu Jammy Package	21m 17s
K Tests	26m 25s
Nix: Maven	1m 9s
Nix flake (self-hosted, linux, normal)	2m 0s
Nix flake (macos-13, macos-13)	10m 12s
Nix flake (MacM1, self-macos-12)	15s
Performace Tests	4m 59s
	1h 6m 48s

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