RCBC-552: Handle query error code 2120

[DemetrisChr]

Changes

• Update the C++ core to d08dddc (v1.5.x). The new logic is entirely within the core.
• Declare the SDK_QUERY_2120 performer cap
• Update the FIT protocol to the latest

Results

QuerySimulatedErrorCodeTest.handleError2120 FIT test passes

[Copilot]

🟡 Changes recommended

The updated protobuf API introduces ambiguous/unsafe defaults (replica index defaulting) and unclear precedence between new scoring controls that should be clarified to avoid inconsistent behavior across implementations.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates the FIT performer protocol (and advertised capabilities) alongside a core bump, with the stated goal of supporting/validating handling for query error code 2120 while keeping the FIT protocol aligned with the latest upstream definitions.

Changes:

• Adds the SDK_QUERY_2120 capability to the performer and defines new protocol caps/types for updated FIT protocol features.
• Extends the protocol with KV GetReplica command support types and replica-related exception enums.
• Extends the Search protocol with scoring configuration options (score fusion controls).

File summaries

File	Description
fit-performer/proto/shared.exceptions.proto	Adds new replica-related exception type enum values.
fit-performer/proto/sdk.workload.proto	Wires a new kv.GetReplica command into the collection-level workload oneof.
fit-performer/proto/sdk.search.proto	Adds search scoring messages and new SearchOptions fields to control scoring behavior.
fit-performer/proto/sdk.kv.replicas.proto	Introduces replica strategy/index protocol messages for GetReplica.
fit-performer/proto/sdk.kv.options.proto	Adds GetReplicaOptions to KV options.
fit-performer/proto/sdk.kv.commands.proto	Adds the GetReplica KV command and imports replica strategy types.
fit-performer/proto/sdk.cluster.query.index_manager.proto	Removes an unused proto import.
fit-performer/proto/sdk.caps.proto	Adds new capability enum values (SDK_SEARCH_SCORE_FUSION, SDK_QUERY_2120, SDK_GET_REPLICA).
fit-performer/lib/fit/performer/service.rb	Advertises SDK_QUERY_2120 as supported by the performer.

Review details

• Files reviewed: 10/10 changed files
• Comments generated: 2
• Review effort level: Lite

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