fix rat and checkstyle issue

[AlbericByte]

Fixes #15124

Description

Building Druid with the below command on master/v27.0 branches:

mvn clean package install -DskipTests -Pdist -Prat
the build failed with the below error.

Update the following configuration to fix this issue:

• checkstyle configurations
• rat excludes configurations

Fixed the bug ...

Release note

---

Key changed/added classes in this PR

• checkstyle-suppressions.xml
• pom.xml

---

This PR has:

• been self-reviewed.
• using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

[FrankChen021]

The original issue is not re-produced on the master branch, but got a lots of checkstyle problems when running the command

mvn package install -DskipTests -Pdist -Prat

The checkstyle problems are all for files in the generated-source directory of druid-sql module. I think the change in this PR makes sense.

But I would like to suggest using global match to exclude all checks for the generated source files like the following instead of adding supression rules one by one to the supression file.

<suppress files="[\\/]target[\\/]generated-test-sources[\\/]" checks=".*"/>
<suppress files="[\\/]target[\\/]generated-sources[\\/]" checks=".*"/>

[FrankChen021]

Remove all rules from this file for generated-source and generated-test-sources and add the following two rules:

[FrankChen021]

The URL in Line 27 of this file is out of date. Please also change it to: https://checkstyle.org/filters/suppressionfilter.html

[AlbericByte]

@FrankChen021 good catch, fixed, Thanks

[FrankChen021]

This problem is only re-produced when running command 'mvn clean package install'.
The checkstyle runs twice for one module, one is the at the very beginning of the build phase, that is the validate phase, the other is after the 'install' phase.

I don't know why this happens. We can investigate this separately. For GHA, I think there's no need to make changes now until we find out the root cause why the checkstyle runs twice under the 'package install' command

[cryptoe]

Why is this change required ?