test: Remove SentryTestObserver (#2796)

We are not using the SentryTestObserver and therefore we can remove it.

Sentry.xcodeproj/project.pbxproj

@@ -554,7 +554,6 @@
 		7BED3576266F7BFF00EAA70D /* TestSentryCrashWrapper.m in Sources */ = {isa = PBXBuildFile; fileRef = 7BED3575266F7BFF00EAA70D /* TestSentryCrashWrapper.m */; };
 		7BEF4957270C4B9D00F8F30E /* SentryUIViewControllerSwizzlingTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BEF4956270C4B9D00F8F30E /* SentryUIViewControllerSwizzlingTests.swift */; };
 		7BEFB044270B0F630025F808 /* SentryTracerObjCTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 7BEFB043270B0F630025F808 /* SentryTracerObjCTests.m */; };
-		7BF1F6AE282A4FE2006BD6AB /* SentryTestObserver.m in Sources */ = {isa = PBXBuildFile; fileRef = 7BF1F6AD282A4FE2006BD6AB /* SentryTestObserver.m */; };
 		7BF536D124BDF3E7004FA6A2 /* SentryEnvelopeTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BF536D024BDF3E7004FA6A2 /* SentryEnvelopeTests.swift */; };
 		7BF536D424BEF255004FA6A2 /* SentryAssertions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BF536D324BEF255004FA6A2 /* SentryAssertions.swift */; };
 		7BF6505F292B77EC00BBA5A8 /* SentryMetricKitIntegrationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BF6505E292B77EC00BBA5A8 /* SentryMetricKitIntegrationTests.swift */; };
@@ -1435,8 +1434,6 @@
 		7BED3575266F7BFF00EAA70D /* TestSentryCrashWrapper.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = TestSentryCrashWrapper.m; sourceTree = "<group>"; };
 		7BEF4956270C4B9D00F8F30E /* SentryUIViewControllerSwizzlingTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryUIViewControllerSwizzlingTests.swift; sourceTree = "<group>"; };
 		7BEFB043270B0F630025F808 /* SentryTracerObjCTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SentryTracerObjCTests.m; sourceTree = "<group>"; };
-		7BF1F6AC282A4FC6006BD6AB /* SentryTestObserver.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SentryTestObserver.h; sourceTree = "<group>"; };
-		7BF1F6AD282A4FE2006BD6AB /* SentryTestObserver.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SentryTestObserver.m; sourceTree = "<group>"; };
 		7BF536D024BDF3E7004FA6A2 /* SentryEnvelopeTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryEnvelopeTests.swift; sourceTree = "<group>"; };
 		7BF536D324BEF255004FA6A2 /* SentryAssertions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryAssertions.swift; sourceTree = "<group>"; };
 		7BF6505E292B77EC00BBA5A8 /* SentryMetricKitIntegrationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryMetricKitIntegrationTests.swift; sourceTree = "<group>"; };
@@ -2956,8 +2953,6 @@
 				7B6D98EC24C703F8005502FA /* Async.swift */,
 				7BF9EF712722A84800B5BBEF /* SentryClassRegistrator.h */,
 				7BF9EF732722A85B00B5BBEF /* SentryClassRegistrator.m */,
-				7BF1F6AC282A4FC6006BD6AB /* SentryTestObserver.h */,
-				7BF1F6AD282A4FE2006BD6AB /* SentryTestObserver.m */,
 				7B72D23928D074BC0014798A /* TestExtensions.swift */,
 				7BB7E7C629267A28004BF96B /* EmptyIntegration.swift */,
 				7B4F22DB294089530067EA17 /* FormatHexAddress.swift */,
@@ -4071,7 +4066,6 @@
 				7BE3C7752445C82300A38442 /* SentryCurrentDateTests.swift in Sources */,
 				7B3398672459C4AE00BD9C96 /* SentryEnvelopeRateLimitTests.swift in Sources */,
 				8EA9AF492665AC48002771B4 /* SentryPerformanceTrackerTests.swift in Sources */,
-				7BF1F6AE282A4FE2006BD6AB /* SentryTestObserver.m in Sources */,
 				7B3B473E25D6CEA500D01640 /* SentryNSErrorTests.swift in Sources */,
 				632331F62404FFA8008D91D6 /* SentryScopeTests.m in Sources */,
 				D808FB88281AB33C009A2A33 /* SentryUIEventTrackerTests.swift in Sources */,