Update Env validations code

The "update env validation code" patch will updates the env.ts file to be compatible with the new API.

npx @adonisjs/upgrade-kit@latest upgrade-env-config

pnpm dlx @adonisjs/upgrade-kit@latest upgrade-env-config

Following are the steps performed by this patch.

• Move env.ts to start/env.ts file.

• Rename Env.rules to Env.create and await the method call.

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  - export default Env.rules({
  + export default await Env.create(new URL('../', import.meta.url), {
  

• Delete the contracts/env.ts file

That's all!