Avoid using `merge_nodes` by default #6937

Job	Run time
Java: Linting	1m 19s
Pyk: Code Quality & Unit Tests (3.10)	1m 26s
Pyk: Code Quality & Unit Tests (3.11)	1m 16s
Pyk: Code Quality & Unit Tests (3.12)	1m 24s
Code Quality Checks	1s
K: Ubuntu Jammy Package	32m 33s
K: Ubuntu Jammy Frontend Package	19m 46s
Pyk: Nix Build (ubuntu-latest)	38s
K: Nix Build & Test (self-hosted, linux, normal)	6m 26s
K: Source Build & Test	33m 30s
Pyk: Nix Build (macos-14)	1m 24s
K: Nix Build & Test (MacM1, self-macos-12)	26m 14s
Pyk: Documentation	4m 51s
Pyk: Profiling	4m 1s
Pyk: Integration Tests	17m 59s
Pyk: Regression Tests	17m 21s
	2h 50m 9s

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