refactor: improve lucene handling in gravsearch (DEV-2148)

[BalduinLandolt]

Pull Request Checklist

Task Description/Number

Currently, LuceneQueryPattern is the only type in the Gravsearch AST which doesn't correspond to valid SPARQL, and it always gets transformed away into the same statement.
This PR removes the unnecessary type from the AST system.

Basic Requirements

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• fix: represents bug fixes
• refactor: represents production code refactoring
• feat: represents a new feature
• docs: documentation changes (no production code change)
• chore: maintenance tasks (no production code change)
• test: all about tests: adding, refactoring tests (no production code change)
• other... Please describe:

Does this PR introduce a breaking change?

• Yes
• No
• Maybe (not 100% sure => check with FE)

Does this PR change client-test-data?

• Yes (don't forget to update the JS-LIB team about the change)
• No

[linear]

DEV-2148 Improve Lucene handling in Gravsearch Transformers

[codecov]

Codecov Report

Patch coverage: 94.23% and project coverage change: +2.16 🎉

Comparison is base (7af1c27) 85.13% compared to head (d9ee5c2) 87.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2667      +/-   ##
==========================================
+ Coverage   85.13%   87.30%   +2.16%     
==========================================
  Files         277      277              
  Lines       28958    28928      -30     
==========================================
+ Hits        24654    25256     +602     
+ Misses       4304     3672     -632     

Impacted Files	Coverage Δ
...a/webapi/messages/util/search/QueryTraverser.scala	92.20% <ø> (-0.10%)	⬇️
...nora/webapi/messages/util/search/SparqlQuery.scala	83.01% <ø> (+0.77%)	⬆️
...h/gravsearch/transformers/OntologyInferencer.scala	92.50% <ø> (-1.25%)	⬇️
...ch/gravsearch/transformers/SelectTransformer.scala	83.33% <ø> (-2.39%)	⬇️
...rch/gravsearch/transformers/WhereTransformer.scala	100.00% <ø> (ø)
...a/org/knora/webapi/util/ZScopedJavaIoStreams.scala	86.36% <ø> (+38.21%)	⬆️
...ravsearch/types/GravsearchTypeInspectionUtil.scala	93.97% <83.33%> (+1.11%)	⬆️
...search/prequery/InferenceOptimizationService.scala	90.62% <87.50%> (+2.74%)	⬆️
...la/org/knora/webapi/routing/v2/SearchRouteV2.scala	85.15% <91.66%> (+0.23%)	⬆️
.../org/knora/webapi/messages/OntologyConstants.scala	99.74% <100.00%> (+0.12%)	⬆️
... and 5 more

... and 40 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.