Remove experimental bun support #2733

Job	Run time
typecheck / typecheck	6m 8s
units / 🧪 Unit Tests	23m 22s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	2m 10s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	2m 12s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	4m 35s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	5m 35s
	44m 2s

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