feat: make testcontainer tempo startup timeout configurable

[brendanjryan]

Summary

• add a startupTimeout option to testcontainers.Instance.tempo so callers can tune readiness in slower environments
• introduce a shared internal container-options module for testcontainers-backed instances, so future container adapters can reuse the same option pattern
• keep the default startup timeout unchanged at 10_000ms
• harden tests for fork PRs by avoiding empty VITE_FORK_URL values and giving slow-start tempo integration tests explicit time budgets
• include a patch changeset entry for release notes

Validation

• pnpm check
• pnpm check:types
• pnpm exec vitest run src/testcontainers/Instance.test.ts --testTimeout=120000

[pkg-pr-new]

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npm i https://pkg.pr.new/prool@68

commit: 8423134

[brendanjryan]

Superseded by a clean PR with only the startup timeout changes (no unrelated CI/test modifications).