Swallow errors when trying to delete jobs that don't exist

[efekarakus]

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Today, trying to delete jobs copilot job delete in environments with no cluster result in the following error:

✘ Failed to stop running tasks of job reporter from environment bootstrap: no cluster found in environment bootstrap.
✘ execute job delete: stop tasks for environment bootstrap: no cluster found in environment bootstrap

Copilot should swallow the error if there are no jobs in the first place and exit successfully.

Reproduction steps

1. Run copilot env init -n bootstrap to create an environment with only IAM roles and no cluster yet.
2. Run copilot job init -n reporter to create a scheduled job.
3. Run copilot job delete to trigger the error.

Note that after step 1, we did not run copilot env deploy to create the ECS cluster.