Avoid race conditions between the home screen's crash alert and Sentry's onLastRunStatusDetermined

By converting the `lastCrashEventID` to a publisher that the VM can just listen to instead of relying on start to match a pre-set event

ElementX/Sources/Services/BugReport/BugReportServiceProtocol.swift

@@ -50,9 +50,8 @@ enum BugReportServiceError: LocalizedError {
 // sourcery: AutoMockable
 protocol BugReportServiceProtocol: AnyObject {
     var isEnabled: Bool { get }
-    var crashedLastRun: Bool { get }
     
-    var lastCrashEventID: String? { get set }
+    var lastCrashEventIDSubject: CurrentValueSubject<String?, Never> { get }
     
     func submitBugReport(_ bugReport: BugReport,
                          progressListener: CurrentValueSubject<Double, Never>) async -> Result<SubmitBugReportResponse, BugReportServiceError>