fixed protoc-plugin build failure

[Vuhag123]

fixed protoc-plugin build failure and now build successful.
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[linux-foundation-easycla]

• ✅login: Vuhag123 / (ac48850)

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[Vuhag123]

@sampajano , @stanley-cheung After successfully resolving the build issue with the protoc-gen-grpc-web plugin, I'm now encountering a new problem related to the protoc-gen-js plugin. The issue from changes in the JavaScript code generation for Protobuf, as the older implementation has been moved and is now redirected to a new repository: https://github.com/protocolbuffers/protobuf-javascript.

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Step 3/8 : RUN protoc -I=. echo.proto --js_out=import_style=commonjs:./commonjs-example --grpc-web_out=import_style=commonjs,mode=grpcwebtext:./commonjs-example
---> Running in c88dd7eaa418
protoc-gen-js: program not found or is not executable
Please specify a program using absolute path or make sure the program is available in your PATH system variable
--js_out: protoc-gen-js: Plugin failed with status code 1.
The command '/bin/sh -c protoc -I=. echo.proto --js_out=import_style=commonjs:./commonjs-example --grpc-web_out=import_style=commonjs,mode=grpcwebtext:./commonjs-example' returned a non-zero code: 1
ERROR: Service 'commonjs-client' failed to build : Build failed