build(test): Add Go 1.24 and 1.25, remove 1.19 and 1.18

[haoxins]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

https://telemetry.go.dev/#charts%3acmd%2fcompile%3aGoVersion

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

[Copilot]

Pull Request Overview

This PR updates the GitHub Actions testing matrix to include newer Go versions (1.24 and 1.25) while removing older versions (1.18 and 1.19), maintaining support for the latest 6 Go versions.

• Updates Go version matrix from ['1.18', '1.19', '1.20', '1.21', '1.22', '1.23'] to ['1.20', '1.21', '1.22', '1.23', '1.24', '1.25']
• Ensures consistent testing across all CI jobs with the updated version range

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