fix(monitors): use monitor_tags API parameter for --tags flag

[dragon3]

What does this PR do?

This pull request fixes monitors list --tags to filter by monitor tags instead of query scope tags by using the correct API parameter.

Motivation

The --tags flag was wired to the Datadog API's tags query parameter, which filters by tags in the monitor's query scope (e.g., avg:cpu{env:prod}). But I/users expect --tags to filter by monitor tags — the organizational tags assigned to monitors for grouping.The correct API parameter for this is monitor_tags.

Additional Notes

N/A

Checklist

• The code change follows the project conventions (see CONTRIBUTING.md)
• Tests have been added/updated (if applicable)
• Documentation has been updated (if applicable)
• All CI checks pass
• Code coverage is maintained or improved

Related Issues

[dragon3]

Thanks!