Remove unused rate limiting config from providers

[Copilot]

Provider rate limiting (rate_limit, rate_interval) is not used. Remove it from the API spec, backend, and UI.

OAPI Spec & Generated Code

• Removed rate_limit and rate_interval fields from Provider, CreateProvider, UpdateProvider schemas in resources.yml
• Updated resources_gen.go — removed ProviderRateInterval, CreateProviderRateInterval, UpdateProviderRateInterval types and constants
• Updated management.generated.ts — removed corresponding TypeScript fields

Backend

• Removed RateLimit/RateInterval from Provider and ProviderUpdate structs
• Stripped from all provider SQL queries (SELECT, INSERT, UPDATE) across providers.go and organizations.go
• Removed rate limit handling in create/update controller handlers

UI

• Removed rate limit and rate interval form fields from IntegrationModal.tsx
• Cleaned up unused Select component imports
• Removed rate_limit/rate_interval from TypeScript Provider interface and ProviderCreateParams
• Removed provider-specific rate limit locale entries from en.json

Not touched

• Balancer journey step rate limiting — separate feature, still in use
• DB columns — left in place; no destructive migration
• Top-level locale keys rate_limit/rate_interval — still used by Balancer step

Original prompt

Please remove the rate limiting configurations from the wasm modules they are not used at the moment. Please remove them from the ui as well if they are hard coded. Please check if rate limiting is referenced anywhere else.

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