feat: render traceability on a page

[a-zw]

See https://eclipse-score.github.io/docs-as-code/pr-608/internals/requirements/requirement_coverage.html

[github-actions]

License Check Results

🚀 The license check job ran with the Bazel command:

bazel run --lockfile_mode=error //src:license-check

Status: ⚠️ Needs Review

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[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.6.0) and connecting to it...
INFO: Invocation ID: 469a6a5c-d065-48cb-b0cd-5e64b21f393c
Computing main repo mapping: 
Loading: 
Loading: 0 packages loaded
Loading: 0 packages loaded
WARNING: Target pattern parsing failed.
ERROR: Skipping '//src:license-check': no such target '//src:license-check': target 'license-check' not declared in package 'src' defined by /home/runner/work/docs-as-code/docs-as-code/src/BUILD
ERROR: no such target '//src:license-check': target 'license-check' not declared in package 'src' defined by /home/runner/work/docs-as-code/docs-as-code/src/BUILD
INFO: Elapsed time: 5.195s
INFO: 0 processes.
ERROR: Build did NOT complete successfully
ERROR: Build failed. Not running target

[github-actions]

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

[Copilot]

Pull request overview

Adds an internal documentation page that renders traceability/coverage information (requirements ↔ tests and requirements ↔ source-code links) directly in the Sphinx docs, using the same score_metrics data as CI quality gates.

Changes:

• Introduces a new “Requirement Test Coverage” page with needpie charts and needtable traceability tables.
• Links the new page from the internals/requirements index and toctree.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docs/internals/requirements/requirement_coverage.rst	New dashboard page showing requirement/test/code-link coverage and traceability tables.
docs/internals/requirements/index.rst	Adds requirement_coverage to the section description and toctree.

[MaximilianSoerenPollak]

LGTM 💯