APP-1675 - Enhance update application version command with source fla…

[yurinovo18]

Summary

• Add version-update-sources CLI command to add sources to existing draft application versions (APP-1675).
• Refactor source and filter parsing into a shared version_source_parser used by both version-create and version-update-sources.
• Add e2e coverage: generic artifact upload helper, draft version creation, and update-sources flow with package + artifact sources.

API Endpoint: PATCH /v1/applications/{application_key}/versions/{version} (query params: async, dry_run, fail_fast)

Changes

CLI / Commands

• New command version-update-sources (vus): adds sources and optional filters to a draft version via --source-type-artifacts, --source-type-packages, --source-type-builds, --source-type-release-bundles, --source-type-application-versions, or --spec; supports --sync, --dry-run, --fail-fast (apptrust/commands/version/update_app_version_sources_cmd.go).
• Flags: New VersionUpdateSources command constant and FailFastFlag; version-update-sources registered in cli/cli.go and apptrust/commands/flags.go.
• Refactor: create_app_version_cmd.go now delegates to buildSourcesAndFiltersFromContext() in apptrust/commands/version/version_source_parser.go; parsing for builds, release bundles, application versions, packages, artifacts, spec file, and filters moved into shared parser (create command simplified).

Test Plan

• Unit tests for version-update-sources command (run + source flags).
• Unit tests for UpdateAppVersionSources (sync, async, dry_run, fail_fast).
• Existing create-version and parser tests updated and passing.
• E2E: draft version create + update-sources with artifact; both package and artifact present in version content.
• Manual: run jf at version-update-sources <app-key> <version> with source flags against a real draft version.