{BugFix} Core - Fix NaN comparison failures in data provider test helpers

Summary:
Explanation:
Test helper compare functions did not handle NaN and uninitialized values correctly, causing deterministic and flaky test failures in VrsDataProvider.multiThreadGetDataByIndex and VrsDataProvider.getDataByIndex.

Two issues fixed:
1. Internal CompareDataHelper: EXPECT_EQ(NaN, NaN) always fails per IEEE 754. AriaGen1 test VRS data has NaN in image temperature_deg_c field (sensor unavailable). Replaced with NaN-safe comparison.
2. OSS CompareDataHelper: EyeGaze spatial_gaze_point_in_cpf and combined_gaze_origin_in_cpf are Eigen::Vector3f with no default initialization. When VRS validity flags are false, the vectors contain uninitialized memory. Moved isApprox checks behind validity flag guards.

Reproducibility:
Both single-threaded (getDataByIndex) and multi-threaded (multiThreadGetDataByIndex) tests now pass on all three test sequences (AriaGen1, AriaGen2, AriaGen2PFrame).

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overriding_review_checks_triggers_an_audit_and_retroactive_review
Oncall Short Name: nebula_functionality_sutdy

landed-with-radar-review

Differential Revision: D104139932

fbshipit-source-id: 19d34893185586189efb09e66946220791fdf349

Author: kongchen1992

core/data_provider/test/CompareDataHelper.h

@@ -433,12 +433,16 @@ inline void compare(
   EXPECT_NEAR(eyeGaze1.pitch_low, eyeGaze2.pitch_low, tolerance);
   EXPECT_NEAR(eyeGaze1.pitch_high, eyeGaze2.pitch_high, tolerance);
 
-  EXPECT_TRUE(
-      eyeGaze1.spatial_gaze_point_in_cpf.isApprox(eyeGaze2.spatial_gaze_point_in_cpf, tolerance));
-  EXPECT_TRUE(eyeGaze1.combined_gaze_origin_in_cpf.isApprox(
-      eyeGaze2.combined_gaze_origin_in_cpf, tolerance));
   EXPECT_EQ(eyeGaze1.spatial_gaze_point_valid, eyeGaze2.spatial_gaze_point_valid);
+  if (eyeGaze1.spatial_gaze_point_valid && eyeGaze2.spatial_gaze_point_valid) {
+    EXPECT_TRUE(
+        eyeGaze1.spatial_gaze_point_in_cpf.isApprox(eyeGaze2.spatial_gaze_point_in_cpf, tolerance));
+  }
   EXPECT_EQ(eyeGaze1.combined_gaze_valid, eyeGaze2.combined_gaze_valid);
+  if (eyeGaze1.combined_gaze_valid && eyeGaze2.combined_gaze_valid) {
+    EXPECT_TRUE(eyeGaze1.combined_gaze_origin_in_cpf.isApprox(
+        eyeGaze2.combined_gaze_origin_in_cpf, tolerance));
+  }
 
   // Compare left and right eyes
   const auto& vergence1 = eyeGaze1.vergence;