Replace apiVersion with requireVersion

[SteveL-MSFT]

PR Summary

Rename apiVersion to requireVersion but keep apiVersion as an alias

PR Context

Fix #1376

[Copilot]

Pull request overview

Renames the configuration document resource version requirement field from apiVersion to the clearer requireVersion, while preserving backward compatibility by accepting apiVersion as an alias during deserialization.

Changes:

• Update configurator resource discovery to use require_version instead of api_version.
• Update config document model to serialize as requireVersion and accept apiVersion as an alias.
• Update PowerShell versioning tests to use requireVersion and add coverage for the apiVersion alias.

Reviewed changes

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

File	Description
lib/dsc-lib/src/configure/mod.rs	Switches discovery/filtering to read the version requirement from require_version.
lib/dsc-lib/src/configure/config_doc.rs	Renames the serialized field to requireVersion and adds apiVersion as a serde alias; updates related unit assertions.
dsc/tests/dsc_config_version.tests.ps1	Updates YAML to requireVersion and adds a test ensuring apiVersion still works as an alias.

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