Update label logic

[riaankleinhans]

• Introduced 'dd/triage/needs-security-assessment' label with a description for security assessment requirements.
• Updated 'tag/security-compliance' to 'tag/security-and-compliance' in ruleset.
• Added temporary debug step in labeler workflow to log event context details.
• Changed reference from comment body to issue body in labeler workflow.

[Copilot]

Pull request overview

Updates the repository’s labeling automation by introducing a new DD triage label, aligning TAG label naming, and refining the GitHub Actions workflows that apply labels (both automatic and slash-command driven).

Changes:

• Added dd/triage/needs-security-assessment label and included it in /dd/triage command rules.
• Renamed the TAG label in the ruleset from tag/security-compliance to tag/security-and-compliance.
• Split slash-command handling into a dedicated workflow and adjusted labeler workflow to use issue/PR body instead of comment body; added temporary debug logging.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/slash-commands.yaml	New workflow to dispatch and process slash commands via repository_dispatch and apply labels through the labeler action.
.github/workflows/labeler.yaml	Removes issue_comment trigger; adds debug logging; switches labeler input from comment body to issue body for issues.
.github/labels.yaml	Adds new DD triage label and updates TAG ruleset label name.
.github/README_Labelling.md	New documentation describing slash commands and automatic labeling behavior.

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