Re-remove webpack (again again)

[mjbvz]

This reverts commit 1d31c3c.

Creating full build to make sure terrapin has all the packages now: https://dev.azure.com/monacotools/Monaco/_build/results?buildId=418467&view=results

[Copilot]

Pull request overview

This PR removes the remaining webpack-based extension bundling infrastructure from the repo build pipeline, while keeping the Monaco test packaging step working by adding webpack (and related loaders) as local devDependencies under test/monaco.

Changes:

• Move Monaco test bundling to use a locally installed webpack binary and add the required webpack toolchain dependencies to test/monaco.
• Remove webpack-related dependencies from the root package.json/package-lock.json.
• Delete legacy extension webpack tooling (extensions/shared.webpack.config.mjs, extensions/mangle-loader.js) and remove webpack build paths from extension packaging tasks.

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/monaco/package.json	Switch bundle-webpack to webpack and add local webpack + loader devDependencies (plus postcss).
test/monaco/package-lock.json	Lockfile updates for the newly added Monaco-local webpack toolchain.
package.json	Remove root-level webpack-related dependencies and types.
package-lock.json	Remove lockfile entries related to the removed root-level webpack toolchain.
extensions/shared.webpack.config.mjs	Delete shared webpack config for extensions.
extensions/mangle-loader.js	Delete webpack loader used for mangling in production builds.
build/lib/extensions.ts	Remove webpack-based extension packaging code paths (including webpackExtensions) and related imports.
build/gulpfile.extensions.ts	Remove logic that discovered/ran webpack configs for web extensions; keep esbuild-only flow.

Files not reviewed (1)

• test/monaco/package-lock.json: Language not supported

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[Copilot]

fromLocal still takes a disableMangle argument (now renamed to _disableMangle) but it is no longer used after removing the webpack/mangle-loader pipeline. Either remove this parameter from fromLocal (and its callers) or explicitly document that it’s currently unused/no-op, so callers don’t assume it affects extension packaging.