Remove overly broad Copilot CLI timestamped ERROR pattern

[Copilot]

The Copilot engine's timestamped ERROR pattern (\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z)\s+\[(ERROR)\]\s+(.+) was matching too many log lines, causing false positives in error detection.

Changes

• Removed pattern from copilot_engine_tools.go: Deleted the "Copilot CLI timestamped ERROR messages" pattern from GetErrorPatterns()
• Updated test expectations: Removed assertions in error_validation_test.go, pattern_error_counting_test.go, and engine_error_patterns_test.go that validated the removed pattern

Error detection still works

The Copilot engine retains comprehensive error detection through:

• Generic ERROR patterns (from common patterns shared across engines)
• Bracketed format: [2024-01-01T10:00:00.123Z] ERROR: message
• Shell/Node.js specific patterns
• Permission-denied warnings

The removed pattern was redundant with the generic ERROR pattern while being more prone to false positives due to its strict timestamp format requirements.

Original prompt

Remove this error pattern from copilot as it matches too many errors:

Pattern 6/16: Copilot CLI timestamped ERROR messages - regex: (\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z)\s+\[(ERROR)\]\s+(.+)

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