[GOBBLIN-2242]Add cert based authentication in mysql shared-gobblin

[pratapaditya04]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-2242

Description

• Here are some details about my PR, including screenshots (if applicable):
  Summary
  Add SSL mode support for MySQL connections in MysqlStateStore with sslMode=VERIFY_IDENTITY when enabled via configuration.
  Changes
  ConfigurationKeys.java: Fixed constant STATE_STORE_DB_SSL_MODE_ENABLED (was incorrectly mapped to "state.store.db.user")
  MysqlStateStore.java:
  Added constants SSL_MODE_PROPERTY and SSL_MODE_VERIFY_IDENTITY
  Added conditional logic to set sslMode=VERIFY_IDENTITY driver property when state.store.db.sslModeEnabled=true
  MysqlStateStoreTest.java: Added 3 test cases covering enabled/disabled/default SSL mode configurations

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[Copilot]

Pull request overview

This PR adds SSL mode support for MySQL connections in the Gobblin metastore by enabling certificate-based authentication with the VERIFY_IDENTITY SSL mode when configured.

Key Changes:

• Added a new configuration key state.store.db.sslModeEnabled to enable SSL mode
• Modified MysqlStateStore.newDataSource() to conditionally set sslMode=VERIFY_IDENTITY on the HikariDataSource
• Added comprehensive unit tests to verify SSL mode behavior in enabled, disabled, and default configurations

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
gobblin-api/src/main/java/org/apache/gobblin/configuration/ConfigurationKeys.java	Adds the STATE_STORE_DB_SSL_MODE_ENABLED configuration constant for controlling SSL mode
gobblin-metastore/src/main/java/org/apache/gobblin/metastore/MysqlStateStore.java	Implements SSL mode logic by adding datasource property when configuration is enabled
gobblin-metastore/src/test/java/org/apache/gobblin/metastore/MysqlStateStoreTest.java	Adds unit tests covering SSL mode enabled, disabled, and default (not configured) scenarios

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