#23926 fix(Kotlin): use the global apiNamePrefix and apiNameSuffix settings instead of apiSuffix (generator's option)

fixes (#23822)

As discussed in #23834 opened PR for master aswell as the change has a fallback.

Removes Kotlin specific apiSuffix additionalSetting.
Adds support for global apiNamePrefix and apiNameSuffix settings to the kotlin generator.

PR checklist

• Read the contribution guidelines.
• Run the following to build the project and update samples:

  ./mvnw clean package || exit
  ./bin/generate-samples.sh ./bin/configs/*.yaml || exit
  ./bin/utils/export_docs_generators.sh || exit
  

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  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
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Kotlin comittee members:
@karismann (2019/03) @Zomzog (2019/04) @andrewemery (2019/10) @4brunu (2019/11) @yutaka0m (2020/03) @stefankoppier (2022/06) @e5l (2024/10) @dennisameling (2026/02)

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Summary by cubic

Kotlin generators now use the global apiNamePrefix and apiNameSuffix for API class names, replacing the Kotlin-only apiSuffix. Default behavior is unchanged: classes end with Api, and empty names produce DefaultApi.

• Bug Fixes

  • AbstractKotlinCodegen.toApiName now builds names as prefix + camelized name + suffix; empty names return DefaultApi.
  • Removed apiSuffix across the codebase (including CodegenConstants, generator options, docs, and tests). Added tests for prefix, suffix, and prefix+suffix.

• Migration

  • Replace -DapiSuffix=Foo with -DapiNameSuffix=Foo (and -DapiNamePrefix=Bar if needed). No change if you use the default Api suffix.