Generate protobuf code for TypeScript service - Frontend

[Sozhan308]

Changes

Part of #1787 to generate profobuf files for all services.

This PR implements pre-generation of protobuf definitions for the frontend service

1. Created a dedicated Dockerfile for protobuf generation

   • Added src/frontend/genproto/Dockerfile for handling proto generation

2. Updated main frontend Dockerfile

   • Removed protobuf generation from build stage
   • Added pre-generated protos copy
   • Removed unnecessary protobuf dependencies from runner stage

Testing

• Verified proto generation using docker-gen-proto.sh

Merge Requirements

For new features contributions, please make sure you have completed the following
essential items:

• CHANGELOG.md updated to document new feature additions
• Appropriate documentation updates in the docs
• Appropriate Helm chart updates in the helm-charts

Maintainers will not merge until the above have been completed. If you're unsure
which docs need to be changed ping the
@open-telemetry/demo-approvers.