[Repo Assist] fix: add retry delay to WorldBank HTTP requests (handles transient 502 errors)

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Root Cause (Issue #1748)

The CI failure is not related to the FSharp.TypeProviders.SDK update. The actual error (visible in the build log) is:

error FS3021: ... Failed to request 'https://api.worldbank.org/v2/country?per_page=1000&format=json&page=1'. 
Error: System.Net.WebException: The remote server returned an error: (502) Bad Gateway.

The WorldBank type provider makes live HTTP requests at compile time to populate the Countries, Indicators, Regions, and Topics provided types. When the WorldBank API was temporarily returning 502, the type provider threw an exception that became a compiler error (FS3021), causing the test project to fail to build.

The Fix

Previously, retries on failure happened immediately with no delay between attempts. This means all 5 retries would fail in rapid succession during a transient server-side outage (e.g. 502 Bad Gateway), exhausting all retries within milliseconds.

This PR adds a 2-second delay (retryDelayMs = 2000) between retries, so the total retry window is ~10 seconds. This gives the WorldBank API time to recover from brief load spikes or gateway errors before all retries are exhausted.

Changes

• src/FSharp.Data.WorldBank.Core/WorldBankRuntime.fs: Add Async.Sleep retryDelayMs before each retry in worldBankRequest

Trade-offs

• Slower failure: If the API is truly unavailable (not just transiently), it takes 10+ extra seconds to exhaust retries. This is acceptable for a type provider that runs at design time.
• Slower Intellisense on flaky connections: In a development environment with intermittent network issues, the 2s delay would slightly slow down type checking. This is a minor inconvenience.

Note: A more comprehensive fix would pre-seed the WorldBank schema cache with static fixture data, so the type provider never needs to make network requests in CI. That would be a larger change and could be done as a follow-up.

Test Status

• ✅ FSharp.Data.WorldBank.Core builds successfully
• ⚠️ The FSharp.Data.Tests project (which contains the WorldBank integration tests) requires live WorldBank API access — it cannot be validated in this environment without network access to api.worldbank.org

Closes #1748

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