chore: defineCommand refactor for `wrangler dev` #4899

Job	Run time
Checks	0s
Add PR to project	3s
Checks	2m 10s
Tests (macos-13, ./fixtures/*)	1m 40s
Tests (macos-13, ./packages/*)	1s
Tests (ubuntu-latest, ./fixtures/*)	2m 12s
Tests (ubuntu-latest, ./packages/*)	2m 6s
Tests (ubuntu-latest, ./tools)	32s
Tests (windows-latest, ./fixtures/*)	45s
Tests (windows-latest, ./packages/*)	45s
	10m 14s

Provide feedback