Add `klean` command #7251

Job	Run time
Java: Linting	1m 15s
Pyk: Code Quality & Unit Tests (3.10)	1m 24s
Pyk: Code Quality & Unit Tests (3.11)	1m 18s
Pyk: Code Quality & Unit Tests (3.12)	1m 26s
Pyk: Code Quality & Unit Tests (3.13)	2m 1s
Code Quality Checks	1s
K: Ubuntu Jammy Frontend Package	4m 16s
Pyk: Nix Build (ubuntu-24.04)	1m 15s
K: Nix Build & Test (self-hosted, linux, normal)	4m 57s
Pyk: Nix Build (macos-14)	2m 25s
K: Source Build & Test	25m 28s
K: Nix Build & Test (MacM1, self-macos-12)	24m 33s
K: Ubuntu Jammy Package	21m 19s
Pyk: Profiling	3m 25s
Pyk: Integration Tests	22m 4s
Pyk: Regression Tests	18m 6s
Pyk: Documentation	4m 45s
	2h 19m 58s

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