chore(typescript): rename shouldGenerateWebsocketClients to generateWebSocketClients

[Swimburger]

Description

Renames the shouldGenerateWebsocketClients configuration option to generateWebSocketClients (also fixes casing: Websocket → WebSocket). The old name is preserved as a deprecated fallback for backwards compatibility.

Changes Made

• Moved shouldGenerateWebsocketClients to the deprecated section of TypescriptCustomConfigSchema and added generateWebSocketClients as the primary field
• Updated SdkGeneratorCli.ts parsing to prefer generateWebSocketClients with fallback to shouldGenerateWebsocketClients
• Renamed all internal usages across SdkCustomConfig, SdkGenerator, SdkClientClassGenerator, and GeneratedSdkClientClassImpl
• Updated test files and seed fixtures (seed.yml, metadata.json) to use the new name
• Added versions.yml entry (v3.56.2)

Review Checklist

• Verify backwards compat fallback in SdkGeneratorCli.ts:51 — parsed?.generateWebSocketClients ?? parsed?.shouldGenerateWebsocketClients ?? false
• Confirm the Zod strictObject still accepts the old field name (it's kept in the schema's deprecated section at line 102)
• No remaining references to the old name outside of the deprecated fallback path and Zod schema

Testing

• pnpm run check (biome) passes
• pnpm format applied
• All CI checks passed (compile, test, seed tests, lint)

Link to Devin session: https://app.devin.ai/sessions/d8ce068101844e7b8b41db4d4546b912
Requested by: @Swimburger

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✅ Devin Review: No Issues Found

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