Stop running product tests with Databricks 11.3 LTS

[ebyhr]

Description

Databricks 11.3 LTS is going to reach EOL on Oct 19. https://docs.databricks.com/aws/en/release-notes/runtime/

Release notes

(x) This is not user-visible or is docs only, and no release notes are required.

Summary by Sourcery

Remove end-of-life Databricks 11.3 LTS from live product tests and CI, clean up obsolete version checks, and add lightweight plugin unit support for reading Databricks 11.3 data

Enhancements:

• Drop DatabricksVersion constant and conditional branches for runtime version 11.3 in product tests
• Omit all suite definitions, CI jobs, and test groups targeting Databricks 11.3 LTS
• Add a static plugin resource and a TestDeltaLakeBasic unit test to verify reading region data from Databricks 11.3 LTS

CI:

• Remove suite-delta-lake-databricks113 job and related environment variables from GitHub Actions CI

[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• The new TestDeltaLakeBasic test for databricks113 is no longer included in any CI suite (suite-delta-lake-databricks113 was removed), so it will never run—please re-enable or reassign it to an active suite.
• After consolidating away the 11.3 version checks, verify that all test group annotations still map to existing suites so no tests are inadvertently skipped.
• Consider removing or documenting the remaining databricks113 test resources if they are no longer needed now that 11.3 support is dropped.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The new TestDeltaLakeBasic test for databricks113 is no longer included in any CI suite (suite-delta-lake-databricks113 was removed), so it will never run—please re-enable or reassign it to an active suite.
- After consolidating away the 11.3 version checks, verify that all test group annotations still map to existing suites so no tests are inadvertently skipped.
- Consider removing or documenting the remaining databricks113 test resources if they are no longer needed now that 11.3 support is dropped.

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[chenjian2664]

do we still needs those files?

[ebyhr]

Yes because tables created by Databricks 11.3 should be readable even after the EOL.