Add 'Optional' field to rules (non-mandatory, excluded from compliance)

[xezpeleta]

Feature Request: Optional Rule Field

Description

Add an "Optional" boolean field to rules. When enabled, the rule is still evaluated and its results are visible, but it is not mandatory — meaning it won't affect the parent ruleset's compliance status.

UX Requirements

• Edit rule page: add a checkbox field labeled "Optional", positioned immediately after the existing "Disabled" field
• The field should look and behave identically to the "Disabled" field (same styling, same toggle pattern)
• Disabled by default (rules remain mandatory unless explicitly marked optional)

Behavior

• Optional rules are still executed/evaluated
• Optional rule results are displayed in the UI
• Optional rules do not count toward the parent ruleset's compliance calculation
• A rule can be both Optional and Disabled (Disabled takes precedence — not evaluated at all)

Acceptance Criteria

• New "Optional" field in Edit Rule form, placed right after "Disabled"
• Disabled by default
• Optional rules are evaluated but excluded from compliance scoring
• UI clearly indicates when a rule is optional
• Backend filters out optional rules when calculating ruleset compliance