Add support for Sentry monitoring

[pvannierop]

Description: This PR will add option to monitor the application with Sentry. Sentry monitoring will be enabled by the following:

1. Add the sentry profile to active spring profiles.
2. Set a SENTRY_DSN environment variable that points to the desired Sentry DSN.
3. (Optional) Set the SENTRY_LOG_LEVEL environment variable to control the minimum log level of events sent to Sentry.
   The default log level for Sentry is WARN. Possible values are TRACE, DEBUG, INFO, WARN, and ERROR.

The docs were updated with these instructions.

Checklist:

• The Main workflow has succeeded
• The Gatling tests have passed
• I have logged into the portal running locally with default admin credentials
• I have updated the README files if this change requires documentation update
• I have commented my code, particularly in hard-to-understand areas