Add dynamic Go version matrix to workflow

[duanemay]

Runs all minor versions from that in the go directive to the latest stable

[Copilot]

Pull request overview

This PR modernizes the GitHub Actions workflow by implementing a dynamic Go version matrix that automatically tests against all minor versions from the go.mod directive through the latest stable release, replacing the previous hardcoded "oldstable" version. It also standardizes test execution to use the Ginkgo test runner with comprehensive flags including race detection and randomization.

Changes:

• Added a new go-versions job that uses arnested/go-version-action@v2 to dynamically determine Go versions to test
• Modified the build job to depend on go-versions and run tests across a matrix of Go versions
• Switched test command from go test to go run github.com/onsi/ginkgo/v2/ginkgo with comprehensive test flags

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