1366 update exit code

[DmitryMK]

Addresses #1366
It is build on top of #1365, which should be merged (or rejected) first.

[Copilot]

Pull Request Overview

Updates the application's exit code handling to return exit code 2 for error conditions instead of 0, addressing issue #1366. This ensures proper error reporting to external systems that depend on exit codes.

• Changed application exit codes from 0 to 2 for various error conditions
• Added exclude rules functionality with new --exclude-rules CLI option
• Added validation to prevent simultaneous use of include and exclude rules

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
core.py	Added exclude-rules CLI option and updated exit codes to 2 for error conditions
cdisc_rules_engine/models/validation_args.py	Added exclude_rules field to validation args model
scripts/script_utils.py	Enhanced rule loading functions to support exclude rules and updated error handling
tests/unit/test_script_utils.py	Added comprehensive tests for new exclude rules functionality
tests/unit/test_services/test_data_service/test_data_service.py	Updated test data to include additional None parameter
tests/QARegressionTests/test_core/test_validate.py	Added tests for exclude rules and updated expected exit codes
README.md	Updated documentation to include new exclude-rules option

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[DmitryMK]

Reverted the change introduced by #1351 for the -vx flag (--validate-xml).

[RamilCDISC]

Could you please resolve the conflicts on this ticket ? and then we are good to merge.