[DOCS] go/README.md references removed go.work

[TOMOFUMI-KONDO]

📋 Prerequisites

• I have searched the existing issues to avoid creating a duplicate
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📝 Issue Description

#1385 introduced go.work, and #1485 removed it. However, go/README.md still referenes go.work in several places.

✅ Suggested Content or Change

Update the go/README.md based on the changes in #1485

🙋 Willing to Contribute?

• I am willing to submit a PR for this documentation update