MP Config - CDI TCK Synthetic Observers Fix

[MattGill98]

The CDI TCK will fail against any container with the ConfigCdiExtension registered as synthetic observers don't contain any annotated method, which causes a NPE during the 'ProcessObserverMethod'.

These synthetic events can be safely ignored, as it isn't a valid use of MP Config.

Note that this was discovered when using the MP Config implementation in GlassFish.

[arjav-desai]

@MattGill98 Can you please sign the OCA https://github.com/oracle/helidon/blob/master/CONTRIBUTING.md#code, as its required for "Contributing to Project Helidon"?

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