(backport): Make Pub/Sub integration tests less flaky (#2546)

[meltsufin]

• Make PubTemplateIntegrationTests less flaky

[sonarcloud[bot]]

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[codecov[bot]]

Codecov Report

Merging #2547 into 1.1.x will decrease coverage by 11.84%. The diff coverage is n/a.

@@              Coverage Diff              @@
##              1.1.x    #2547       +/-   ##
=============================================
- Coverage     80.17%   68.33%   -11.85%     
+ Complexity     1745     1437      -308     
=============================================
  Files           203      203               
  Lines          5750     5750               
  Branches        578      578               
=============================================
- Hits           4610     3929      -681     
- Misses          907     1584      +677     
- Partials        233      237        +4     

Flag	Coverage Δ	Complexity Δ
#integration	?	?
#unittests	68.33% <ø> (ø)	1437.00 <ø> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
...-sample/src/main/java/com/example/WorkService.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-4.00%)
...ple/src/main/java/com/example/HelloController.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...ple/src/main/java/com/example/MyAppProperties.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
...-sample/src/main/java/com/example/SinkExample.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...-sample/src/main/java/com/example/UserMessage.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-8.00%)
...ample/src/main/java/com/example/WebController.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...ample/src/main/java/com/example/SourceExample.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...-sample/src/main/kotlin/com/example/data/Person.kt	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
...mple/src/main/kotlin/com/example/app/Controller.kt	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-4.00%)
...main/kotlin/com/example/app/PubSubConfiguration.kt	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
... and 72 more

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