[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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• 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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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.58%. Comparing base (5a614e9) to head (c76bb1e).
⚠️ Report is 1253 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #22101       +/-   ##
=============================================
+ Coverage     37.02%   73.58%   +36.55%     
- Complexity    12201    32592    +20391     
=============================================
  Files          1734     1874      +140     
  Lines        132277   139354     +7077     
  Branches      14480    15279      +799     
=============================================
+ Hits          48974   102537    +53563     
+ Misses        76823    28909    -47914     
- Partials       6480     7908     +1428     

Flag	Coverage Δ
inttests	24.61% <0.00%> (-0.20%)	⬇️
systests	24.38% <0.00%> (-0.05%)	⬇️
unittests	72.84% <100.00%> (+40.86%)	⬆️

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

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

... and 1440 files with indirect coverage changes

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[heesung-sohn]

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

#20782

[heesung-sohn]

We are reverting this commit from branch-3.0.

[heesung-sohn]

@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