Gate logRequest() behind debugger-only mode to reduce agent overhead

[Zakaria-Kofiro]

Gate logRequest() behind debugger-only mode to reduce agent overhead

Summary

• Adds isDebugMode() default method to TankHttpLogger interface (returns false)
• HttpRequestFactory overrides it to return APITestHarness.getInstance().isDebug()
• BaseRequest.logRequest() early-returns when force=false and not in debug mode, skipping expensive string building that was happening on every request during load tests
• Adds 3 unit tests covering the skip, force-override, and debug-mode paths

Why

logRequest() builds a full request/response string (URL, headers, body, cookies) on every HTTP call. This work is only consumed by the Tank Debugger UI — production agents were paying the cost unconditionally.

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