docs: document Allure 3 config flags (singleFile, reportLanguage, open, groupBy)

[MohabMohie]

Motivation

• Surface and document Allure 3 (Awesome plugin) configuration options recently exposed by the engine so users can control packaging, language, browser-open behavior, and report grouping.
• Provide file/CLI/code examples and defaults so users can set these options via custom.properties, Maven -D flags, or the SHAFT.Properties API.

Description

• Add a new section to docs/Reporting/reporting.mdx documenting allure.singleFile, allure.reportLanguage, allure.open, and allure.groupBy with file-, CLI-, and code-based examples and recommended groupBy presets.
• Update docs/Properties/PropertiesList.mdx to expose getters/setters and default values for the new Allure properties and add them to the defaults quick-reference table.
• Update docs/Basic_Config/basicConfig.md to include example custom.properties entries showing allure.singleFile and allure.groupBy.
• Add troubleshooting guidance for Allure CLI generation logs and note the distinction between SHAFT's allure.automaticallyOpen and the Allure CLI open flag.

Testing

• Ran git diff --check -- docs/Basic_Config/basicConfig.md docs/Properties/PropertiesList.mdx docs/Reporting/reporting.mdx which produced no problems. (success)
• Built the site with npm run build and the Docusaurus static build completed successfully, generating the build output. (success)

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Codex Task

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