[fix][ws] Fix issue where metadataStoreAllowReadOnlyOperations setting is ignored by WebSocket server

[massakam]

Motivation

Brokers and proxies can continue to provide services even if more than half of the ZooKeeper servers acting as configuration metadata store go down and switch to read-only mode by writing metadataStoreAllowReadOnlyOperations=true in their configuration files.

• [fix][broker] Support zookeeper read-only config. #19156
• [improve] [broker] Introduce metadataStoreAllowReadOnlyOperations to deprecate zookeeperAllowReadOnlyOperations #19246

On the other hand, WebSocket servers could not continue to provide services even though metadataStoreAllowReadOnlyOperations=true was written in the configuration file.

This is because the metadataStoreAllowReadOnlyOperations field exists in the ServiceConfiguration and ProxyConfiguration classes, but not in the WebSocketProxyConfiguration class.

Modifications

Added the metadataStoreAllowReadOnlyOperations field to the WebSocketProxyConfiguration class.

Verifying this change

• Make sure that the change passes the CI checks.

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 72.62%. Comparing base (d992dc5) to head (3a938ea).

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #25281      +/-   ##
============================================
- Coverage     72.91%   72.62%   -0.30%     
+ Complexity    34577    33929     -648     
============================================
  Files          1959     1959              
  Lines        155543   155543              
  Branches      17741    17741              
============================================
- Hits         113421   112963     -458     
- Misses        33185    33568     +383     
- Partials       8937     9012      +75     

Flag	Coverage Δ
inttests	25.71% <ø> (-0.53%)	⬇️
systests	22.32% <ø> (-0.28%)	⬇️
unittests	73.58% <ø> (-0.30%)	⬇️

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

Files with missing lines	Coverage Δ
...websocket/service/WebSocketProxyConfiguration.java	100.00% <ø> (ø)

... and 112 files with indirect coverage changes

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