Refactor yaml parsing

[AlexanderLanin]

📌 Description

Some further refactorings to make the final PR #253 smaller

🚨 Impact Analysis

• This change does not violate any tool requirements and is covered by existing tool requirements
• This change does not violate any design decisions
• Otherwise I have created a ticket for new tool qualification

✅ Checklist

• Added/updated documentation for new or changed features
• Added/updated tests to cover the changes
• Followed project coding standards and guidelines

[Copilot]

Pull Request Overview

This PR refactors the YAML parsing logic in the score metamodel extension to improve code organization and maintainability. The changes break down the large load_metamodel_data() function into smaller, focused helper functions while also fixing some data structure inconsistencies.

• Extracts parsing logic into dedicated helper functions for better separation of concerns
• Changes default_options() return type from list to set for more efficient operations
• Fixes a regex pattern in the metamodel configuration

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
yaml_parser.py	Major refactoring with new helper functions and improved data structure handling
metamodel_types.py	Added spacing and comments for better readability
metamodel.yaml	Fixed missing anchor in regex pattern
check_options.py	Updated variable names and adapted to use set operations

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[github-actions]

License Check Results

🚀 The license check job ran with the Bazel command:

bazel run //src:license-check

Status: ⚠️ Needs Review

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[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.3.0) and connecting to it...
INFO: Invocation ID: 1a948a29-9864-4abd-a4d5-49c3693dd0a3
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    currently loading: src
Analyzing: target //src:license-check (1 packages loaded, 0 targets configured)
Analyzing: target //src:license-check (1 packages loaded, 0 targets configured)

Analyzing: target //src:license-check (71 packages loaded, 9 targets configured)

Analyzing: target //src:license-check (123 packages loaded, 2288 targets configured)

Analyzing: target //src:license-check (134 packages loaded, 2484 targets configured)

INFO: Analyzed target //src:license-check (137 packages loaded, 4500 targets configured).
[7 / 13] Creating runfiles tree bazel-out/k8-opt-exec-ST-d57f47055a04/bin/external/score_tooling+/dash/tool/formatters/dash_format_converter.runfiles [for tool]; 0s local
INFO: Found 1 target...
Target //src:license.check.license_check up-to-date:
  bazel-bin/src/license.check.license_check
  bazel-bin/src/license.check.license_check.jar
INFO: Elapsed time: 13.008s, Critical Path: 0.34s
INFO: 13 processes: 4 disk cache hit, 9 internal.
INFO: Build completed successfully, 13 total actions
INFO: Running command line: bazel-bin/src/license.check.license_check src/formatted.txt <args omitted>
usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
       [-confidence <int>] [-ef <url>] [-excludeSources <sources>] [-help] [-lic
       <url>] [-project <shortname>] [-repo <url>] [-review] [-summary <file>]
       [-timeout <seconds>] [-token <token>]

[github-actions]

The created documentation from the pull request is available at: docu-html