docs: generate sample code in the Java microgenerator

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PiperOrigin-RevId: 356341083
Source-Link: googleapis/googleapis@8d8c008

[codecov]

Codecov Report

Merging #498 (b56be2f) into master (d089a0b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #498   +/-   ##
=========================================
  Coverage     75.38%   75.38%           
+ Complexity      761      760    -1     
=========================================
  Files           129      129           
  Lines          3875     3875           
  Branches        173      174    +1     
=========================================
  Hits           2921     2921           
  Misses          850      850           
  Partials        104      104           

Impacted Files	Coverage Δ	Complexity Δ
...google/cloud/pubsublite/v1/AdminServiceClient.java	91.37% <ø> (ø)	55.00 <0.00> (ø)
...oogle/cloud/pubsublite/v1/CursorServiceClient.java	82.00% <ø> (ø)	14.00 <0.00> (ø)
...ubsublite/v1/PartitionAssignmentServiceClient.java	34.78% <ø> (ø)	4.00 <0.00> (ø)
...le/cloud/pubsublite/v1/PublisherServiceClient.java	34.78% <ø> (ø)	4.00 <0.00> (ø)
...e/cloud/pubsublite/v1/SubscriberServiceClient.java	34.78% <ø> (ø)	4.00 <0.00> (ø)
...e/cloud/pubsublite/v1/TopicStatsServiceClient.java	69.23% <ø> (ø)	10.00 <0.00> (ø)

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