Issue 33831 container limit problem

[gortiz-dotcms]

Problem

The insert functions in lacked maxContentlets validation before inserting content.
Drag-and-drop validation worked correctly, but the plus button (+) insertion bypassed validation entirely.

Fix

Added maxContentlets validation to both insertion functions, also added an error message for this scenario.

This PR fixes: #33831

[Copilot]

Pull request overview

This PR fixes issue #33831 where the container limit validation was bypassed when adding content via the plus button (+). Previously, only drag-and-drop operations validated the maxContentlets limit correctly.

Key changes:

• Added maxContentlets validation to both insertion functions (regular and positioned) before content insertion
• Changed backend validation logic from < to <= to correctly enforce limits
• Introduced error handling with new CONTAINER_INSERT_ERROR enum to distinguish between duplicate content and container limit errors

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Language.properties	Added new localized error messages for container limit reached scenario
PageRenderUtil.java	Changed comparison operator from < to <= to correctly enforce container limit during rendering
enums.ts	Introduced CONTAINER_INSERT_ERROR enum with CONTAINER_LIMIT_REACHED and DUPLICATE_CONTENT values
utils/index.ts	Added maxContentlets validation in both insertContentletInContainer and insertPositionedContentletInContainer functions with proper error code reporting
edit-ema-editor.component.ts	Added error handling for container limit reached cases with appropriate warning messages and constants for message keys
utils.spec.ts	Added comprehensive test coverage for container limit validation scenarios including edge cases with limits of 1 and 2
edit-ema-editor.component.spec.ts	Updated existing test data with appropriate maxContentlets values to align with new validation logic