[fix][broker] Fix print cluster migration state response

[rdhabalia]

PIP: #16551

Motivation

Currently, pulsar-admin cli is not printing cluster migration state response and this PR fixes the printing it on console.

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.32%. Comparing base (bbc6224) to head (94b491a).
Report is 707 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #23535      +/-   ##
============================================
+ Coverage     73.57%   74.32%   +0.74%     
- Complexity    32624    34424    +1800     
============================================
  Files          1877     1943      +66     
  Lines        139502   147045    +7543     
  Branches      15299    16205     +906     
============================================
+ Hits         102638   109285    +6647     
- Misses        28908    29322     +414     
- Partials       7956     8438     +482     

Flag	Coverage Δ
inttests	27.42% <0.00%> (+2.84%)	⬆️
systests	24.37% <0.00%> (+0.04%)	⬆️
unittests	73.71% <100.00%> (+0.86%)	⬆️

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Files with missing lines	Coverage Δ
.../java/org/apache/pulsar/admin/cli/CmdClusters.java	71.91% <100.00%> (-2.94%)	⬇️

... and 653 files with indirect coverage changes