update to Go 1.24.4 and simplify build

[harp-intel]

This pull request includes several changes to streamline the Docker build process, update dependencies, and simplify the project structure. The most important changes include removing redundant Dockerfiles, consolidating build steps, updating the Go base image, and upgrading dependencies in go.mod.

Docker build process improvements:

• Removed the build.Dockerfile file, consolidating its functionality into builder/build.Dockerfile and simplifying the build process.
• Updated the Go base image in builder/build.Dockerfile to golang:1.24.4 with a new digest for improved security and compatibility.
• Modified builder/build.sh to remove references to the deleted build.Dockerfile and streamline the container creation and file copying process.

Dependency updates:

• Upgraded several dependencies in go.mod, including Prometheus libraries, golang.org/x packages, and google.golang.org/protobuf, to their latest versions for improved functionality and bug fixes.

Cleanup and simplification:

• Removed commented-out ENTRYPOINT and CMD lines from Dockerfile to clean up unused code.