Add warning log when AV-related Helm values are detected

[danc094codetogether]

Description:

CodeTogether no longer supports integrated Audio/Video features. Update the Helm chart to detect when legacy AV-related values are present in values.yaml, and log a clear warning message during startup.
This should not break the deployment just print a warning indicating that AV is deprecated and ignored.

Acceptance Criteria:

• Detect presence of any AV-related Helm values.
• Emit a log message at startup (INFO or WARN) such as: "A/V settings detected but A/V is no longer supported in CodeTogether. These settings will be ignored."
• No functional behavior should change.
• Deployment should continue normally.

[DavidRS13]

This will be tested as part of parent ticket https://github.com/CodeTogether-Inc/hq/issues/7070