* Adjusted integration tests to use geoip test fixture or to use test databases provided via config dirs (for qa module / docs).
* Kept the geolite2-databases dependency for most of the unit tests only.
* Made fallback_to_default_databases parameter on geoip processor a noop and emit deprecation warning upon using it.
* If no geoip databases are available yet to a node then the geoip processor factory returns a processor implementation that flags documents that databases are unavailable. This allows these documents to be reindex later with a pipeline. These documents will have a tag string array field, which contains a string _geoip_database_unavailable_{database_name} for each missing database in a pipeline.
* Added reload pipeline capabilities is IngestService, so that when databases are available again on a node then pipelines with geoip processor definition can be reloaded.
Relates to #68920
In https://github.com/elastic/kibana/pull/113783, we renamed Kibana's **Ingest Pipelines** feature to **Ingest Pipelines**. This updates screenshots and references for the feature. It also replaces a few remaining `ingest node pipeline` references.
