feat: fetch start command for bootstrap from samples.json

[J0]

What kind of change does this PR introduce?

Currently, we use a hardcoded start command (e.g. npm run dev) which might not generalize to non-javascript projects. This PR aims to fix this by fetching from samples.json

[notion-workspace]

Use start command defined in starter template

[coveralls]

Pull Request Test Coverage Report for Build 8584240972

Details

• 10 of 12 (83.33%) changed or added relevant lines in 1 file are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 57.828%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/bootstrap/bootstrap.go	10	12	83.33%

Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	11.76%

Totals
Change from base Build 8574460707:	0.0%
Covered Lines:	6386
Relevant Lines:	11043

---

💛 - Coveralls

[J0]

Switch to pass down Start from top level command instead.