Remove unused DSE authentication support

[dkropachev]

Closes #1030. Part of #1025.

What and why

Remove DSE GSSAPI, proxy authentication/execution, DSE plaintext aliases, their tests, and the ApacheDS/Kerberos dependency chain. ScyllaDB does not use or test these paths, so deleting them reduces unsupported production and test code.

The ordinary plaintext provider remains and now implements the standard Cassandra/Scylla SASL PLAIN exchange directly.

Validation

• mvn -pl core clean test — 4,007 tests, no failures or errors.
• mvn -pl integration-tests -am -DskipTests test-compile
• mvn -DskipTests install — full 17-module reactor, including shaded and distribution packaging.

Dependencies: none. Cherry-picked commits: none.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between dc58ee9 and 0c3ca6b.

📒 Files selected for processing (32)

• changelog/README.md
• core/src/main/java/com/datastax/dse/driver/api/core/auth/BaseDseAuthenticator.java
• core/src/main/java/com/datastax/dse/driver/api/core/auth/DseGssApiAuthProviderBase.java
• core/src/main/java/com/datastax/dse/driver/api/core/auth/DsePlainTextAuthProviderBase.java
• core/src/main/java/com/datastax/dse/driver/api/core/auth/ProgrammaticDseGssApiAuthProvider.java
• core/src/main/java/com/datastax/dse/driver/api/core/auth/ProxyAuthentication.java
• core/src/main/java/com/datastax/dse/driver/api/core/config/DseDriverOption.java
• core/src/main/java/com/datastax/dse/driver/internal/core/auth/DseGssApiAuthProvider.java
• core/src/main/java/com/datastax/dse/driver/internal/core/auth/DsePlainTextAuthProvider.java
• core/src/main/java/com/datastax/oss/driver/api/core/auth/PlainTextAuthProviderBase.java
• core/src/main/java/com/datastax/oss/driver/api/core/auth/ProgrammaticPlainTextAuthProvider.java
• core/src/main/java/com/datastax/oss/driver/api/core/config/TypedDriverOption.java
• core/src/main/java/com/datastax/oss/driver/api/core/session/SessionBuilder.java
• core/src/main/java/com/datastax/oss/driver/internal/core/auth/AuthUtils.java
• core/src/main/java/com/datastax/oss/driver/internal/core/auth/PlainTextAuthProvider.java
• core/src/main/java/com/datastax/oss/driver/internal/core/context/DefaultDriverContext.java
• core/src/main/resources/META-INF/native-image/com.datastax.oss/java-driver-core/reflection.json
• core/src/main/resources/reference.conf
• core/src/test/java/com/datastax/oss/driver/api/core/auth/ProgrammaticPlainTextAuthProviderTest.java
• integration-tests/pom.xml
• integration-tests/src/test/java/com/datastax/dse/driver/api/core/auth/DseGssApiAuthProviderAlternateIT.java
• integration-tests/src/test/java/com/datastax/dse/driver/api/core/auth/DseGssApiAuthProviderIT.java
• integration-tests/src/test/java/com/datastax/dse/driver/api/core/auth/DsePlainTextAuthProviderIT.java
• integration-tests/src/test/java/com/datastax/dse/driver/api/core/auth/DseProxyAuthenticationIT.java
• integration-tests/src/test/java/com/datastax/dse/driver/api/core/auth/EmbeddedAds.java
• integration-tests/src/test/java/com/datastax/dse/driver/api/core/auth/EmbeddedAdsRule.java
• integration-tests/src/test/java/com/datastax/dse/driver/api/core/auth/KerberosUtils.java
• integration-tests/src/test/java/com/datastax/dse/driver/api/core/graph/GraphAuthenticationIT.java
• integration-tests/src/test/resources/logback-test.xml
• manual/core/authentication/README.md
• pom.xml
• upgrade_guide/README.md

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