KAFKA-14728: Don't run 'spotlessScalaCheck' in CI

[dejan2609]

Blocks #13205.

Rationale:

• build works fine in trunk with Gradle 7.6 and spotless gradle plugin 6.13.0 for all currently used JDK versions (that is: JDK 8 / JDK 11 / JDK 17)
• however, recent spotless gradle plugin versions (6.14.+) support only JDK 11+ versions: https://github.com/diffplug/spotless/blob/main/plugin-gradle/CHANGES.md#6140---2023-01-26
• given a fact that Kafka still needs to support JDK 8 builds (until Kafka version 4.0) it is reasonable to simply remove spotless checks out of Jenkinsfile (and re-introduce them when the time comes).

For even more details see GitHub discussion here: #13205 (comment)

[dejan2609]

Only handfull of tests failed (those errors are obviosly unrelated to this small change).

FYI @ijuma

[ijuma]

@mjsax @vvcephei I'm going to merge this PR. If we find a way to support this tool without requiring Java 11, we can re-enable before Apache Kafka 4.0. If not, we can re-enable once we drop support for Java 8. @dejan2609 can you please file a JIRA for re-enabling this with target version 4.0 and set it as a blocker?

[ijuma]

LGTM, thanks.

[guozhangwang]

Thanks @ijuma for the heads up, that makes sense.

[dejan2609]

@ijuma JIRA ticket created here: https://issues.apache.org/jira/browse/KAFKA-14749

[ijuma]

@guozhangwang Note that we found a way to re-enable this when running with Java 11 or newer, see #13311.