chore(devextreme): replace gulp js-bundles-debug with native nx targets

[chaosmirage]

No description provided.

[Copilot]

Pull request overview

This PR replaces the Gulp-based js-bundles-debug task with native Nx targets using a new custom bundle executor in the devextreme-nx-infra-plugin package. This continues the ongoing migration from Gulp to Nx for build orchestration in the DevExtreme monorepo.

Changes:

• Adds a new bundle executor to the nx-infra-plugin that wraps webpack bundling with support for debug and production modes
• Splits the bundle:debug target into two sub-targets (bundle:debug:build and bundle:debug:headers) for better caching and modularity
• Updates the bundle:debug target to use native Nx executors instead of calling Gulp directly

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/nx-infra-plugin/src/executors/bundle/schema.ts	TypeScript schema defining the bundle executor options including entries, source/output directories, mode, and webpack config path
packages/nx-infra-plugin/src/executors/bundle/schema.json	JSON Schema validation for the bundle executor options
packages/nx-infra-plugin/src/executors/bundle/executor.ts	Main executor implementation that loads webpack dynamically, builds entry maps, creates webpack configuration with debug/production modes, and handles BUILD_INTERNAL_PACKAGE environment variable
packages/nx-infra-plugin/src/executors/bundle/executor.e2e.spec.ts	E2E test verifying the executor can bundle multiple entries in debug mode and produces the expected output files
packages/nx-infra-plugin/package.json	Adds webpack as an optional peer dependency and dev dependency to support the new bundle executor
packages/nx-infra-plugin/executors.json	Registers the new bundle executor in the plugin's executor manifest
packages/devextreme/project.json	Replaces gulp js-bundles-debug command with new bundle:debug:build and bundle:debug:headers targets, updates inputs/outputs to match new build structure
pnpm-lock.yaml	Updates webpack and related dependencies, primarily upgrading enhanced-resolve, es-module-lexer, and watchpack versions
.github/copilot-instructions.md	Updates documentation to reflect that bundle creation now uses the devextreme-nx-infra-plugin:bundle executor

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported