T3 (#809) & T4 (#811): Added native migration/rollback executables

[GOKULRAJ136]

Refer Story #807
Fixes #811 & #809

Summary

Adds two native Windows executables — migration.exe and rollback.exe — that perform the Java 11 → 21 JRE swap for the upgrade-revamp feature outside the JVM. The swap deletes and replaces the very jre/ a running JVM would hold open (Windows locks in-use files), so _launcher.jar starts these binaries and exits the JVM first.

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Review details

⚙️ Run configuration

Configuration used: Repository UI

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Plan: Pro

Run ID: 8b8bb660-2038-432f-a804-01bf455e6b24

📥 Commits

Reviewing files that changed from the base of the PR and between 7a43e07 and 7d329c1.

📒 Files selected for processing (4)

• native/README.md
• native/cmd/migration/main.go
• native/cmd/rollback/main.go
• native/internal/upgrade/upgrade.go

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