RUBY-3778 Server deprioritizing in replica sets

[comandeo-mongo]

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[Copilot]

Pull request overview

Updates retry server selection to avoid automatically deprioritizing the failed server in replica sets unless the retryable error indicates server overload (via the SystemOverloadedError label), while preserving existing behavior for sharded and load-balanced topologies.

Changes:

• Add error-aware deprioritization logic to Mongo::Retryable.select_server (replica set: only when SystemOverloadedError label; sharded/load-balanced: always).
• Pass the triggering error into retry server selection for both read and write retry paths (writes also track the most recent retry error).
• Add integration coverage for replica set retry behavior with/without SystemOverloadedError label; update a unit spec cluster double to stub new topology predicates.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
spec/mongo/retryable_spec.rb	Stubs sharded?/load_balanced? on a cluster double to match new retry selection logic.
spec/integration/retryable_reads_errors_spec.rb	Adds replica set integration tests asserting retry server changes based on SystemOverloadedError label.
lib/mongo/retryable/write_worker.rb	Threads retry error context into server selection during write retries.
lib/mongo/retryable/read_worker.rb	Threads original read error context into server selection during read retries.
lib/mongo/retryable.rb	Implements error-aware server deprioritization (replica set vs sharded/load-balanced).

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