[filesystem] Isolate Jindo OSS presigning dependencies (#9856)

[JunRuiLee]

Purpose

Backport of #9856 to release-2.1.

Cherry-picks upstream commit de872c4df69f2c03394e2758c3c55659e8f5888c without conflicts or additional changes. The backport has the same patch ID as the upstream commit and retains the 2.1-SNAPSHOT parent version.

Paimon 2.1 contains the OSS presigning changes introduced by #8832. Their bundled dependencies, including Gson 2.8.6, can shadow libraries supplied by an embedding application such as Doris.

This backport uses the existing PluginLoader and private-directory isolation mechanism, as in paimon-oss, for the OSS presigning implementation and its dependencies. It does not introduce another Maven module or change the shared classloader implementation or the Jindo/Hadoop filesystem loading path.

Tests

Ran the following on this release-2.1 backport with both JDK 8 and JDK 11:

mvn -B -ntp -pl paimon-filesystems/paimon-jindo -am \
  -DskipTests -Dmaven.jar.forceCreation=true clean install

mvn -B -ntp -pl paimon-filesystems/paimon-jindo \
  '-Dtest=JindoFileIOTest#testCreateBlob*+testDisable*+testKeep*' \
  -DwildcardSuites=none test

mvn -B -ntp -pl paimon-filesystems/paimon-jindo \
  surefire:test@integration-tests

• Both clean builds passed with Checkstyle, Spotless, and Enforcer enabled. JDK 11 commands additionally used Maven offline mode.
• Each JDK passed 4 selected unit tests and 23 automatically discovered integration tests, including all 6 JindoPluginITCase tests.
• The module Apache RAT check passed: 16 approved licenses, 0 unknown or unapproved, excluding only the generated dependency-reduced-pom.xml.
• Inspected the packaged JAR: no root-level OSS SDK, Gson, HttpClient, commons-logging, or Hadoop classes; all 16 dependency coordinates are present in NOTICE; the JDOM and JAXB license files match their source resources.
• git diff --check passed.

Local verification does not include a live Doris/OSS deployment. The existing native-filesystem fallback unit test was not selected on this macOS/arm64 host; the test remains unchanged and enabled for supported environments.