Refactor: rename Java packages from org.greenplum to org.apache.cloudberry

[tuhaihe]

This commit performs a global rebranding of the Java package structure to align with the Apache Cloudberry project naming conventions and the official domain (cloudberry.apache.org).

Key changes:

• Renamed all Java package declarations and import statements from 'org.greenplum' to 'org.apache.cloudberry'.
• Restructured physical directory paths from 'org/greenplum/' to 'org/apache/cloudberry/' across all modules (server and automation).
• Updated build configurations:
  • Gradle 'group' in server/build.gradle
  • Maven 'groupId' and dependencies in automation/pom.xml
• Adjusted configuration files including:
  • pxf-profiles-default.xml
  • application.properties
  • log4j2.xml / log4j.properties
• Updated SQL scripts, test expected outputs (.ans, .out), and Concourse CI entrypoint scripts.

This is a structural refactoring with no changes to functional logic.

fix #ISSUE_Number

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[tuhaihe]

Need to rebase this onto PRs #33, #32, and #34 to support the latest file structures.

[ostinru]

It seems to be user-facing breaking changes:

Adjusted configuration files including:

• pxf-profiles-default.xml
• application.properties
• log4j2.xml / log4j.properties

Let's write it down in user-facing docs (somewhere near docs/content/upgrade_to_*.md‎)

[tuhaihe]

It seems to be user-facing breaking changes:

Adjusted configuration files including:

• pxf-profiles-default.xml
• application.properties
• log4j2.xml / log4j.properties

Let's write it down in user-facing docs (somewhere near docs/content/upgrade_to_*.md‎)

Hi @ostinru, thanks for your reminder. I have added one new page to the docs, see commit bbfa97c. PTAL.