Update arctic_vegetation style to show raster values in label

[trey-stafford]

Description

Closes #778

Updates the vegetation legend to show raster value in each label. E.g., B1 - Cryptogam, herb barren to 1: B1 - Cryptogam, herb barren

Checklist

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• The PR description links to issues that it resolves with closes #{issue_number}
• Config lockfile updated (inv config.export > qgreenland/config/cfg-lock.json)
• Environment lockfile updated if needed (conda-lock)
• Version bumped if needed (bumpversion (major|minor|patch|prerelease|build))
• CHANGELOG.md updated (for user-facing changes)
• Documentation updated if needed
• New unit tests if needed

[MattF-NSIDC]

LGTM! I sure wish QGIS kept its XML attributes in a deterministic order!!! 😡

[trey-stafford]

LGTM! I sure wish QGIS kept its XML attributes in a deterministic order!!! 😡

💯