Start `kdist` workers with `spawn` #6698

Job	Run time
Java: Linting	1m 21s
Pyk: Code Quality & Unit Tests (3.10)	1m 27s
Pyk: Code Quality & Unit Tests (3.11)	1m 13s
Pyk: Code Quality & Unit Tests (3.12)	1m 30s
Code Quality Checks	1s
K: Ubuntu Jammy Frontend Package	5m 9s
K: Source Build & Test	22m 57s
K: Nix Build & Test (self-hosted, linux, normal)	5m 50s
Pyk: Nix Build (ubuntu-latest)	41s
K: Ubuntu Jammy Package	17m 43s
K: Nix Build & Test (MacM1, self-macos-12)	25m 50s
Pyk: Nix Build (macos-14)	1m 26s
Pyk: Profiling	2m 52s
Pyk: Integration Tests	23m 48s
Pyk: Documentation	1m 58s
Pyk: Regression Tests	17m 28s
	2h 11m 14s

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