KAFKA-10787: Apply spotless to streams:examples and streams-scala

[gongxuanzhang]

This PR is sub PR from #16097.
It is part of a series of changes to progressively apply [spotless plugin(import-order)] across all modules. In this step, the plugin is activated in the

• stream:test-utils
• streams:upgrade-system-tests-0100

Module and history

Please see the table below for the historical changes related to applying the Spotless plugin

module	apply	related PR
:clients	❌	future
:connect:api	✅	#16299
:connect:basic-auth-extension	✅	#16299
:connect:file	✅	#16299
:connect:json	✅	#16299
:connect:mirror	✅	#16299
:connect:mirror-client	✅	#16299
:connect:runtime	❌	future
:connect:test-plugins	✅	#16299
:connect:transforms	✅	#16299
:core	❌	future
:examples	✅	#16296
:generator	✅	#16296
:group-coordinator:group-coordinator-api	✅	#16298
:group-coordinator	✅	#16298
:jmh-benchmarks	✅	#16296
:log4j-appender	✅	#16296
:metadata	✅	#16297
:server	✅	#16297
:shell	✅	#16296
:storage	✅	#16297
:storage:storage-api	✅	#16297
:streams	❌	future
:streams:examples	✅	#16378
:streams:streams-scala	✅	#16378
:streams:test-utils	✅	#16357
:streams:upgrade-system-tests-0100	✅	#16357
:streams:upgrade-system-tests-0101	✅	#16357
:streams:upgrade-system-tests-0102	✅	#16357
:streams:upgrade-system-tests-0110	✅	#16357
:streams:upgrade-system-tests-10	✅	#16357
:streams:upgrade-system-tests-11	✅	#16357
:streams:upgrade-system-tests-20	✅	#16357
:streams:upgrade-system-tests-21	✅	#16357
:streams:upgrade-system-tests-22	✅	#16357
:streams:upgrade-system-tests-23	✅	#16357
:streams:upgrade-system-tests-24	✅	#16357
:streams:upgrade-system-tests-25	✅	#16357
:streams:upgrade-system-tests-26	✅	#16357
:streams:upgrade-system-tests-27	✅	#16357
:streams:upgrade-system-tests-28	✅	#16357
:streams:upgrade-system-tests-30	✅	#16357
:streams:upgrade-system-tests-31	✅	#16357
:streams:upgrade-system-tests-32	✅	#16357
:streams:upgrade-system-tests-33	✅	#16357
:streams:upgrade-system-tests-34	✅	#16357
:streams:upgrade-system-tests-35	✅	#16357
:streams:upgrade-system-tests-36	✅	#16357
:streams:upgrade-system-tests-37	✅	#16357
:trogdor	✅	#16296
:raft	✅	#16278
:server-common	✅	#16172
:transaction-coordinator	✅	#16172
:tools	✅	#16262
:tools:tools-api	✅	#16262

How to test:

We can run ./gradlew spotlessCheck check for code that does not meet requirements.
If we get report that error , we can run ./gradlew spotlessApply to review my code.
In this PR, all change(exclude build.gradle) byspotlessApply`

[chia7712]

LGTM