Update WithConnectivityCheck to use simplified Akka.Hosting 1.5.55.1 API

[Aaronontheweb]

This PR updates the connectivity health check extension methods to use the simplified Akka.Hosting 1.5.55.1 API pattern, eliminating redundant parameter passing.

Changes

API Improvements

• Simplified API: Options are now automatically accessed from builder.Options
• Backward Compatibility: Previous API remains functional but marked as [Obsolete]
• Enhanced Flexibility: Tags parameter now accepts IEnumerable<string> instead of string[]

Implementation Details

• Updated MongoDbConnectivityCheckExtensions.cs with new simplified overloads for:
  • Journal connectivity checks
  • Standard snapshot store connectivity checks
  • GridFS snapshot store connectivity checks
• Added using System.Collections.Generic; for IEnumerable<string> support
• Upgraded Akka.Hosting dependency from 1.5.55 to 1.5.55.1
• Updated RELEASE_NOTES.md with v1.5.55.1 entry

API Comparison

New Simplified API (Recommended):

journalBuilder: journal =>
{
    journal.WithConnectivityCheck(); // Options automatically accessed from builder
}

Previous API (Still Supported):

journalBuilder: journal =>
{
    journal.WithConnectivityCheck(journalOptions); // Explicit parameter passing
}

Special Handling

The snapshot store simplified API intelligently detects whether the configuration uses standard MongoDB snapshots or GridFS snapshots, handling both scenarios automatically:

if (builder.Options is MongoDbSnapshotOptions snapshotOptions)
{
    // Handle standard snapshot store
}
else if (builder.Options is MongoDbGridFsSnapshotOptions gridFsOptions)
{
    // Handle GridFS snapshot store
}

Benefits

• Cleaner, more intuitive API
• Reduces potential for configuration errors
• Maintains full backward compatibility
• Follows Akka.Hosting 1.5.55.1 patterns
• Automatic detection of snapshot store type

Testing

• Build succeeds with no errors
• Pattern consistent with Akka.Persistence.Linq2Db implementation
• Legacy API continues to work with obsolete warnings

Related to akkadotnet/Akka.Hosting#1.5.55.1