Add customizable tags parameter to health check methods (#679)

[Aaronontheweb]

Summary

Implements issue #679: Add customizable tags parameter to health check builder methods to allow users to override default health check tags.

Changes

Adds a new overload of WithHealthCheck() methods following extend-only design principles:

• Original overload (unchanged): WithHealthCheck(HealthStatus = Degraded, string? name = null) - maintains backward compatibility
• New overload: WithHealthCheck(HealthStatus unHealthyStatus, string? name, IEnumerable<string>? tags) - allows custom tags

When tags parameter is null, defaults are applied:

• Journal: ["akka", "persistence", "journal"]
• Snapshot Store: ["akka", "persistence", "snapshot-store"]

Overloads have non-overlapping signatures to prevent method ambiguity:

• Original has 2 optional parameters
• New overload requires all 3 parameters (no defaults)

Example Usage

// Use default tags (calls original overload)
builder.WithHealthCheck();

// Use default tags with custom status (calls original overload)
builder.WithHealthCheck(HealthStatus.Unhealthy);

// Use custom tags (calls new overload)
builder.WithHealthCheck(
    unHealthyStatus: HealthStatus.Degraded,
    name: "MyHealthCheck",
    tags: new[] { "backend", "database" });

Design Rationale

• Extend-only design: Original method signature is preserved, no modifications to existing APIs
• No binary compatibility issues: New method is additive, existing compiled code continues to work
• No method ambiguity: Overloads have distinct signatures (different parameter requirements)

Testing

• All 18 health check tests pass
• Backward compatibility maintained: existing code calling WithHealthCheck() without tags parameter continues to work