CI/helm: helm-CI's failing

[snazy]

Describe the bug

Helm-CI's consistently failing with this exception:

Caused by: java.lang.IllegalArgumentException: Unsupported feature configuration JSON type: OBJECT
	at org.apache.polaris.service.config.FeaturesConfiguration.configValue(FeaturesConfiguration.java:86)
	at org.apache.polaris.service.config.FeaturesConfiguration.convertMap(FeaturesConfiguration.java:59)
	at org.apache.polaris.service.config.FeaturesConfiguration.parseDefaults(FeaturesConfiguration.java:41)

It could be caused by the changes introduced by #1572. I suspect that that code now gets everything underneath polaris.features and then in consequence fails.

To Reproduce

No response

Actual Behavior

No response

Expected Behavior

No response

Additional context

No response

System information

No response

[snazy]

Related to #1618