COTF: Don't send uncooked packages when cook fails

#rb matt.peters
#jira none
#rnx

[CL 15387983 by Per Larsson in ue5-main branch]

Engine/Source/Runtime/SandboxFile/Public/IPlatformFileSandboxWrapper.h

@@ -44,6 +44,12 @@ class SANDBOXFILE_API FSandboxPlatformFile : public IPlatformFile
 	 */
 	bool				bSandboxEnabled;
 
+	/**
+	 *	Whether access is restricted to the sandbox or not.
+	 *	Defaults to false.
+	 */
+	bool				bSandboxOnly;
+
 	/**
 	 * Clears the contents of the specified folder
 	 *
@@ -163,6 +169,9 @@ public:
 	*/
 	void AddExclusion(const TCHAR* Wildcard, bool bIsDirectory = false);
 
+	/** Whether access is restricted the the sandbox or not. */
+	void SetSandboxOnly(bool bInSandboxOnly);
+
 	// IPlatformFile Interface
 
 	virtual bool					FileExists(const TCHAR* Filename) override;