[improve][admin] Expose the offload threshold in seconds to the admin

[zymap]

---

Fixes #xyz

Main Issue: #xyz

PIP: #xyz

Motivation

We have two configurations to trigger the offload automatically, time and bytes. We only expose the bytes in the admin but didn't expose the time in the admin. When we want to disable it, we need to set both of them to the -1. But we didn't expose the time settings, the offload will never be disabled.

Modifications

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

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• 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:

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• 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

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@zymap Please add the following content to your PR description and select a checkbox:

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.58%. Comparing base (08058b9) to head (c76bb1e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #22101       +/-   ##
=============================================
+ Coverage     36.89%   73.58%   +36.68%     
- Complexity    12161    32592    +20431     
=============================================
  Files          1734     1874      +140     
  Lines        132201   139354     +7153     
  Branches      14466    15279      +813     
=============================================
+ Hits          48770   102537    +53767     
+ Misses        76937    28909    -48028     
- Partials       6494     7908     +1414     

Flag	Coverage Δ
inttests	24.61% <0.00%> (-0.07%)	⬇️
systests	24.38% <0.00%> (+0.05%)	⬆️
unittests	72.84% <100.00%> (+40.94%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ava/org/apache/pulsar/admin/cli/CmdNamespaces.java	78.73% <100.00%> (+78.73%)	⬆️

... and 1440 files with indirect coverage changes

[heesung-sn]

This PR depends on TimeUnitToSecondsConverter, which has not been cherry-picked to branch-3.0.

#20782

[heesung-sn]

We are reverting this commit from branch-3.0.

[heesung-sn]

@zymap Plz raise another PR to branch-3.0 without relying on TimeUnitToSecondsConverter(because TimeUnitToSecondsConverter is not available in branch-3.0), if possible. (targeting release 3.0.4)

[zymap]

#22169 a new PR to branch-3.0 @heesung-sn