Add documentation links to analyzer diagnostics

[Copilot]

Analyzer failures did not expose a direct path to the corresponding rule documentation, forcing users to manually look up guidance. This change attaches rule-specific documentation URLs to the emitted diagnostics so IDEs and tooling can surface the relevant docs inline.

• What changed

  • Added helpLinkUri to every shipped analyzer DiagnosticDescriptor.
  • Wired each diagnostic ID to its published docs page under docs/rules/....
  • Preserved the shared docs target for SWGQL05 and SWGQL06.

• Implementation

  • Introduced a single DiagnosticHelpLinks mapping to keep rule-to-doc URLs centralized.
  • Updated all analyzer descriptors to use the shared mapping instead of embedding URLs ad hoc.

• Guardrails

  • Added a descriptor-level test that asserts every supported diagnostic exposes the expected documentation link, so future rules do not ship without docs wiring.

public static readonly DiagnosticDescriptor Rule = new(
    id: DiagnosticId,
    title: Title,
    messageFormat: MessageFormat,
    category: Category,
    defaultSeverity: DiagnosticSeverity.Warning,
    isEnabledByDefault: true,
    description: Description,
    helpLinkUri: DiagnosticHelpLinks.For(DiagnosticId));