[feat](cloud) implement decouple_instance (#61221)

[w41ter]

When an instance is cloned via clone_instance, it maintains references to the source instance and snapshot. After snapshot compaction completes, these references can be safely removed to decouple the cloned instance, making it fully independent.

Usage Example:

curl -X POST "http://ms_host:port/decouple_instance?instance_id=my_cloned_instance&token=xxx"

Requirements:

• instance_id: The ID of the cloned instance to decouple
• The instance must have been created via clone_instance
• The instance's snapshot_compact_status must be SNAPSHOT_COMPACT_DONE

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[Thearas]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[yiguolei]

run buildall

[hello-stephen]

Cloud UT Coverage Report

Increment line coverage 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	78.47% (1786/2276)
Line Coverage	64.23% (32012/49838)
Region Coverage	65.05% (16011/24612)
Branch Coverage	55.61% (8530/15340)