Search tag concatenation bug

[AzureAaron]

Currently, Search Tags are implemented using string concatenation on the tag instance itself rather than its value which is likely a mistake and means that any manual implementations of Search Tags must override the toString value to return the tag value itself in order for them to work.

MoulConfig should concatenate the actual tag value instead as that's more expected and the current behaviour relies on JVM implementation details to function correctly (as per the JDK 21 JavaDoc on Annotation#toString).

[lineargraph]

ah, i see. the search system as a whole could do a job with a rework.