NIFI-13007 remove solr bundle

[joewitt]

Summary

NIFI-00000

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  • JDK 21

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[exceptionfactory]

Given that Solr still depends on Jetty 10 and NiFi now requires Jetty 12 across the board, removing the optional Solr components is the best path forward for now. There is one line in the developer guide mentioning the include-solr profile, which I will also remove when merging. Thanks for the cleanup @joewitt!