chore: remove workspace artifacts from repository

[shollyman]

This PR excises the use of go workspaces files from this repository. Over time best practices around go workspaces have evolved (https://go.dev/ref/mod#workspaces), and now guidance is generally that workspace files shouldn't be part of the tracked source control artifacts.

This PR also cleans up workspace-isms from various artifacts in the repository, including CI/CD overrides, documentation, and code generator processing.

Addresses #13393

[gemini-code-assist]

Summary of Changes

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This pull request streamlines the repository's Go module management by excising the use of Go workspace files. This change reflects evolving best practices in the Go ecosystem, where workspace files are generally not considered part of tracked source control artifacts. The removal of these files simplifies the repository structure and associated build, test, and code generation processes.

Highlights

• Go Workspace Files Removed: The go.work and go.work.sum files have been completely removed from the repository, aligning with current Go best practices that discourage tracking workspace files in source control.
• CI/CD Script Updates: Continuous Integration and Continuous Delivery (CI/CD) scripts have been updated to remove the GOWORK=off flag from go build and go test commands, simplifying the build and test processes now that workspaces are no longer in use.
• Documentation and Configuration Cleanup: Documentation for the librariangen tool has been revised to remove instructions related to go work use, and the tool's configuration files have been updated to no longer allow read/write permissions for go.work and go.work.sum.

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[gemini-code-assist]

Code Review

This pull request effectively removes Go workspace artifacts (go.work and go.work.sum) from the repository, which is a good practice as these files are typically specific to a developer's local environment. The changes are comprehensive, updating CI/CD scripts, documentation, and code generation configurations to remove any reliance on Go workspaces. The modifications are clean, consistent, and correctly implement the intended cleanup. Overall, this is a solid improvement to the repository's structure and development workflow.