Add `total` to `#let`-bindings where LHS is a variable #3537

Job	Run time
Nix flake (self-hosted, linux, normal)	7m 22s
Version Sync	11s
Nix flake (macos-13, macos-13)	12m 5s
Nix flake (MacM1, self-macos-12)	30m 9s
Check Java code formatting	27s
K Tests	58m 25s
K Ubuntu Jammy Package	25m 27s
Performace Tests	12m 56s
	2h 27m 2s

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