Adds safety checks for getting lib path in symbol resolver

[mghaznav]

Fixes #16106

Description

Fixes an issue where a null, missing, or empty path in a binary image record could cause crashes (unrecognized selector on NSNull) or leave FIRStackFrame.library unpopulated.

Changes

• Safe Type Checking: Validates that binaryImage[@"path"] is a non-empty NSString before calling lastPathComponent.
• dladdr Fallback: Falls back to [NSString stringWithUTF8String:dlInfo.dli_fname].lastPathComponent if the recorded path is null, missing, or empty.
• Nullability Handling: Leaves frame.library as nil if no valid name is resolvable.

Verification

• Verified that valid paths resolve correctly.
• Verified that null, @"", and missing paths fall back to dladdr or remain safely nil without crashing.
• Tested on simulators and a real device

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[mghaznav]

Failing test FIRCLSReportUploaderTests testUrgentWaitUntilUpload is unrelated to this change.