Add Sentry messages to the monitoring dashboard

What does this MR do?

This adds Sentry's captureException calls to the monitoring dashboard vuex actions to help catch network call errors inside production environment, these will be sent to the configured sentry instance inside GitLab's config

#205491 (closed)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content