JS: Fix some Ql4Ql violations.

[michaelnebel]

Fix some Ql4Ql violations based on the following checks

• ql/field-only-used-in-charpred
• ql/could-be-cast
• ql/counting-to-zero
• ql/dataflow-module-naming-convention
• ql/if-with-none
• ql/missing-parameter-qldoc
• ql/misspelling

DCA looks good.

[Copilot]

Pull Request Overview

This PR fixes various Ql4Ql violations across JavaScript CodeQL files, focusing on code quality improvements including naming conventions, spelling corrections, and code simplification.

Key changes include:

• Renaming dataflow configuration modules to follow naming conventions
• Correcting spelling from British "modelling" to American "modeling" and fixing other typos
• Refactoring code to eliminate unused private fields

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
javascript/ql/test/library-tests/FlowSummary/test.ql	Renamed dataflow configuration modules to follow naming conventions
javascript/ql/src/Declarations/UnreachableMethodOverloads.ql	Removed unused private field by inlining variable declaration
javascript/ql/lib/semmle/javascript/security/TaintedUrlSuffixCustomizations.qll	Fixed spelling error: "preverse" to "preserve"
javascript/ql/lib/semmle/javascript/internal/flow_summaries/Strings.qll	Fixed spelling: "modelling" to "modeling" and "behaviour" to "behavior"
javascript/ql/lib/semmle/javascript/internal/flow_summaries/Sets.qll	Fixed spelling: "modelling" to "modeling"
javascript/ql/lib/semmle/javascript/internal/flow_summaries/Promises.qll	Fixed spelling: "modelling" to "modeling"
javascript/ql/lib/semmle/javascript/internal/flow_summaries/Maps.qll	Fixed spelling: "modelling" to "modeling"
javascript/ql/lib/semmle/javascript/internal/flow_summaries/Iterators.qll	Fixed spelling: "modelling" to "modeling"
javascript/ql/lib/semmle/javascript/internal/flow_summaries/Generators.qll	Fixed spelling: "modelling" to "modeling"
javascript/ql/lib/semmle/javascript/internal/flow_summaries/AsyncAwait.qll	Fixed spelling: "modelling" to "modeling"
javascript/ql/lib/semmle/javascript/internal/flow_summaries/Arrays.qll	Fixed spelling: "modelled" to "modeled" and "behaviour" to "behavior"
javascript/ql/lib/semmle/javascript/frameworks/data/internal/ApiGraphModelsSpecific.qll	Fixed spelling: "refering" to "referring"
javascript/ql/lib/semmle/javascript/frameworks/Babel.qll	Removed unused private field by moving variable into exists clause
javascript/ql/lib/semmle/javascript/dataflow/internal/VariableCapture.qll	Fixed spelling: "langauge" to "language"
javascript/ql/lib/semmle/javascript/dataflow/internal/DataFlowPrivate.qll	Fixed spelling: "modelled" to "modeled"
javascript/ql/lib/semmle/javascript/dataflow/internal/BarrierGuards.qll	Removed unused private field by moving variable into exists clause
javascript/ql/lib/semmle/javascript/dataflow/FlowSummary.qll	Fixed spelling: "behaviour" to "behavior" and "modelled" to "modeled"