build(server/routerlicious): remove invalid ESM builds

[jason-ha]

These server package pretend to have ESM support, but the generated javascript is not Node16 ES module compliant. When loaded, users are getting CJS version anyway. So, just remove appearance of ESM support.

[github-actions]

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[Copilot]

Pull request overview

This PR removes misleading ES module build metadata from selected Routerlicious server packages that only produce/serve CommonJS-compatible output.

Changes:

• Removes the module package entry pointing at lib/index.js.
• Removes build:esnext scripts and stops invoking them from build:compile.
• Deletes the unused tsconfig.esnext.json files for the affected packages.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
server/routerlicious/packages/services-client/package.json	Removes ESNext build script and module entry.
server/routerlicious/packages/services-client/tsconfig.esnext.json	Deletes obsolete ESNext TypeScript config.
server/routerlicious/packages/protocol-base/package.json	Removes ESNext build script and module entry.
server/routerlicious/packages/protocol-base/tsconfig.esnext.json	Deletes obsolete ESNext TypeScript config.
server/routerlicious/packages/local-server/package.json	Removes ESNext build script and module entry.
server/routerlicious/packages/local-server/tsconfig.esnext.json	Deletes obsolete ESNext TypeScript config.