refactor: rebrand hydration components as <Island>

[GauBen]

Description

Closes #251

Checklist

Source code

• I've shared and documented any breaking change
• I've reviewed and updated the jahia-depends

Tests

• I've provided Unit and/or Integration Tests
• I've updated the parent issue with required manual validations

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[Copilot]

Pull Request Overview

This PR refactors the hydration system by introducing a new Island component that replaces the existing HydrateInBrowser and RenderInBrowser components. The refactoring consolidates hydration functionality into a single, more flexible component following the Island Architecture paradigm.

• Introduces the new Island component with comprehensive TypeScript typing and flexible hydration modes
• Deprecates HydrateInBrowser and RenderInBrowser components while maintaining backward compatibility
• Updates client-side hydration logic to use a unified DOM marker (jsm-island) and simplified client-only detection

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
javascript-modules-library/src/components/render/Island.tsx	New comprehensive Island component implementation with complex TypeScript generics
javascript-modules-library/src/components/render/RenderInBrowser.tsx	Deprecated component now delegates to Island with clientOnly flag
javascript-modules-library/src/components/render/HydrateInBrowser.tsx	Deprecated component now delegates to Island without clientOnly flag
javascript-modules-library/src/components/render/internal/InBrowser.tsx	Removed internal implementation replaced by Island
javascript-modules-engine/src/client-javascript/react/index.tsx	Updated client hydration logic to use new DOM markers and detection
javascript-modules-library/tsconfig.json	Added verbatimModuleSyntax TypeScript option
Multiple test and example files	Updated to use new Island component API