[chore] Update .NET compliance matrix entries

[martincostello]

Changes

Update the implemented features for the .NET Prometheus exporter:

• Unit Full Words - Update Prometheus exporter name and unit processing opentelemetry-dotnet#4753
• otel_scope labels can be disabled - [Exporter.Prometheus] Add ScopeInfoEnabled option opentelemetry-dotnet#7436

For non-trivial changes, follow the change proposal process.

• Related issues - [Exporter.Prometheus] Update specification compliance matrix opentelemetry-dotnet#7167
• Related OTEP(s)
• Links to the prototypes (when adding or changing features)
• CHANGELOG.md file updated for non-trivial changes
  • For trivial changes, include [chore] in the PR title to skip the changelog check
• Spec compliance matrix updated if necessary
• Declarative config data model is updated if SDK config surface is changed

[Copilot]

Pull request overview

Updates the OpenTelemetry spec compliance matrix to reflect newly implemented .NET Prometheus exporter capabilities, keeping the published matrix and the source YAML in sync with current .NET behavior.

Changes:

• Marked Unit Full Words as implemented (+) for .NET in the compliance matrix.
• Marked “otel_scope labels can be disabled” as implemented (+) for .NET in the compliance matrix.
• Updated both the YAML source (spec-compliance-matrix/dotnet.yaml) and the rendered markdown table (spec-compliance-matrix.md) consistently.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
spec-compliance-matrix/dotnet.yaml	Flips .NET Prometheus exporter feature statuses to + for the two newly supported capabilities.
spec-compliance-matrix.md	Updates the published compliance table rows so the .NET column matches the YAML/source-of-truth changes.

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