[admin-tool] Implement roll forward in the admin tool for testing

[sofiaz11]

Problem Statement

Implement roll forward in the admin tool for testing

Solution

• Add the new command and arguments
• Generate fat jar locally and tested commands:
  1. roll forward for all regions
  2. roll forward for targeted region

Code changes

• Added new code behind a config. If so list the config names and their default values in the PR description.
• Introduced new log lines.
• Confirmed if logs need to be rate limited to avoid excessive logging.

Concurrency-Specific Checks

Both reviewer and PR author to verify

• Code has no race conditions or thread safety issues.
• Proper synchronization mechanisms (e.g., synchronized, RWLock) are used where needed.
• No blocking calls inside critical sections that could lead to deadlocks or performance degradation.
• Verified thread-safe collections are used (e.g., ConcurrentHashMap, CopyOnWriteArrayList).
• Validated proper exception handling in multi-threaded code to avoid silent thread termination.

How was this PR tested?

• New unit tests added.
• New integration tests added.
• Modified or extended existing tests.
• Verified backward compatibility (if applicable).

Does this PR introduce any user-facing or breaking changes?

• No. You can skip the rest of this section.
• Yes. Clearly explain the behavior change and its impact.

[Copilot]

Pull Request Overview

This PR adds support for rolling forward to a future version in the admin tool for testing purposes.

Key Changes

• Added new ROLL_FORWARD_TO_FUTURE_VERSION command to enable testing roll forward functionality
• Introduced ROLL_FORWARD_TIMEOUT_MS optional parameter to configure timeout during roll forward operations
• Implemented the rollForwardToFutureVersion method with proper error handling for invalid integer inputs

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
Command.java	Added new ROLL_FORWARD_TO_FUTURE_VERSION command with URL and STORE as required args, and REGIONS_FILTER and ROLL_FORWARD_TIMEOUT_MS as optional args
Arg.java	Added ROLL_FORWARD_TIMEOUT_MS argument definition for configuring timeout during target colo push
AdminTool.java	Implemented rollForwardToFutureVersion method with parameter parsing, error handling, and calls to the controller client API

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