[Testing copilot agent] Remove unused deprecated logExceptionReportingUrl property

[Copilot]

This PR removes the deprecated and unused logExceptionReportingUrl property from ARTClientOptions as identified in the issue.

Changes Made

• Removed property declaration from ARTClientOptions.h including its deprecation comment
• Removed property initialization from the initDefaults method in ARTClientOptions.m
• Removed property copying from the copyWithZone: method in ARTClientOptions.m

Verification

• ✅ Confirmed the property was only referenced in these two files
• ✅ Verified no tests or other code depends on this property
• ✅ Ensured no references remain anywhere in the codebase
• ✅ Basic syntax validation confirms the changes don't break file structure

Impact

This is a safe removal as:

• The property was already marked as DEPRECATED with a note that it "will be removed in a future version"
• No code in the repository actually uses this property beyond initialization and copying
• The removal eliminates 7 lines of dead code (2 from .m file, 5 from .h file)

Fixes #2025.

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