Update terminology: "Graph Type" → "Query Language"

[kmcginnes]

Description

This PR updates user-facing terminology throughout the application to use "Query Language" instead of "Graph Type" for better clarity and accuracy.

Changes

UI Updates:

• Connection creation form: "Graph Type" → "Query Language"
• Connection detail view: "Graph Type" → "Query Language"
• Connection row display: Updated to use new translation key
• Import graph error messages: "graph type" → "query language"

Translation System:

• Renamed translation key from graph-type to query-language across all three translation files (Gremlin, openCypher, SPARQL)
• Updated all references to use the new query-language key

Documentation Updates:

• Updated README.md environment variable description
• Updated development.md section header to "Supported Graph Data Models and Query Languages"
• Updated features documentation for connection setup
• Updated getting started guide example

Test Updates:

• Updated test expectations in ImportGraphButton.test.tsx to match new terminology
• Enhanced useEdgeAttributesAsScalars.test.ts with separate test suites for Gremlin and openCypher to verify correct terminology ("Edge Label" vs "Relationship Type")

Rationale

"Query Language" more accurately describes what users are selecting (Gremlin, openCypher, or SPARQL) rather than the ambiguous "Graph Type" which could be confused with the data model (property graph vs RDF).

Validation

Related Issues

• Resolves Fix wording for graph type and query engine/language #877
• Part of Update UI labels to be more consistent to the query language #1471

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.83%. Comparing base (c5affc5) to head (d7c490b).
⚠️ Report is 44 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1474       +/-   ##
===========================================
+ Coverage   47.81%   62.83%   +15.02%     
===========================================
  Files         382      315       -67     
  Lines        8525     6530     -1995     
  Branches     3159     2271      -888     
===========================================
+ Hits         4076     4103       +27     
+ Misses       3070     1696     -1374     
+ Partials     1379      731      -648     

Flag	Coverage Δ
unittests	62.83% <100.00%> (+15.02%)	⬆️

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