Explicitly disable attach-scaladocs for pure Java modules

[pan3793]

:mag: Description

export JAVA_HOME=/path/of/openjdk-17
build/mvn clean install -DskipTests -Dmaven.scaladoc.skip=false

[INFO] --- scala-maven-plugin:4.9.2:doc-jar (attach-scaladocs) @ kyuubi-server-plugin ---
[INFO] compiler plugin: BasicArtifact(com.github.ghik,silencer-plugin_2.12.20,1.7.19,null)
error: fatal error: object scala in compiler mirror not found.

Types of changes :bookmark:

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Test Plan 🧪

Successfully run the build command

export JAVA_HOME=/path/of/openjdk-17
build/mvn clean install -DskipTests -Dmaven.scaladoc.skip=false

---

Checklist 📝

• [x] This patch was not authored or co-authored using Generative Tooling

Be nice. Be informative.

[pan3793]

branch-1.8 Java 17 CI is broken due to this, I'd like to have it before releasing 1.8.3

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 0.00%. Comparing base (c391d16) to head (f5cee34). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6820 +/- ## ====================================== Coverage 0.00% 0.00% ====================================== Files 687 687 Lines 42442 42442 Branches 5793 5793 ====================================== Misses 42442 42442 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles