fix(cli): standard log messages are sent to stderr when CI=true

[corymhall]

The CLI currently sends almost all logs to stderr, even success
messages. Based on the linked issue, this was done to make terminal
colors easier to see. While this might make it easier for users that are
running the CLI from their local machine, it causes issues on some CI
systems that will exit if anything is written to stderr (even when the
exit code is 0).

This PR updates all of the logging mechanisms to recognize the ci
argument. If --ci is passed, or the environment variable CI=true
then all logs (except for error logs) will be sent to stdout.
Currently the ci argument was only available on the deploy command,
but this PR moves that to the global arguments list so that it will
apply to all commands.

I tested this manually on a CDK app by using a script to capture
stderr and stdout.

export CI=true
key="$1"

cmd="npx cdk deploy"

errlog=$(mktemp)
stdlog=$(mktemp)
$cmd 1>> "$stdlog" 2> "$errlog"

echo "-------------------errlog---------------------"
cat "$errlog"
echo "-------------------stdlog---------------------"
cat "$stdlog"
rm -f "$errlog"
rm -f "$stdlog"

I also added new unit and integration tests that validate the change.

fixes #7717

---

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Adding new Unconventional Dependencies:

• This PR adds new unconventional dependencies following the process described here

New Features

• Have you added the new feature to an integration test?
  • Did you use yarn integ to deploy the infrastructure and generate the snapshot (i.e. yarn integ without --dry-run)?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[gitpod-io]

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).