[fix][broker] Handle the case when getOwnedServiceUnits fails gracefully

[Demogorgon314]

Motivation

When getOwnedServiceUnits fails, the broker will fail to start, we should handle getOwnedServiceUnits fails gracefully

org.apache.pulsar.broker.PulsarServerException: java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke "org.apache.pulsar.client.api.TableView.entrySet()" because "this.tableview" is null
    at org.apache.pulsar.broker.PulsarService.start(PulsarService.java:993)

Modifications

• Handle getOwnedServiceUnits fails gracefully
• Fix NPE caused by ServiceUnitStateChannel's tableview is null.

Documentation

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.46%. Comparing base (bbc6224) to head (c9e1ea3).
Report is 491 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #23119      +/-   ##
============================================
- Coverage     73.57%   73.46%   -0.11%     
- Complexity    32624    33544     +920     
============================================
  Files          1877     1919      +42     
  Lines        139502   144125    +4623     
  Branches      15299    15748     +449     
============================================
+ Hits         102638   105886    +3248     
- Misses        28908    30118    +1210     
- Partials       7956     8121     +165     

Flag	Coverage Δ
inttests	27.60% <25.00%> (+3.01%)	⬆️
systests	24.71% <25.00%> (+0.38%)	⬆️
unittests	72.54% <100.00%> (-0.31%)	⬇️

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

Files	Coverage Δ
...xtensions/channel/ServiceUnitStateChannelImpl.java	86.42% <100.00%> (+1.11%)	⬆️
...ache/pulsar/broker/namespace/NamespaceService.java	74.21% <100.00%> (+1.97%)	⬆️

... and 522 files with indirect coverage changes