Revert commits related to using an interactive shell for running shell commands

This reverts commits f28b6f439d, dbd407c01d, 5fac40c129, and 5a3049485c.

pkg/commands/oscommands/dummies.go

@@ -51,14 +51,11 @@ func NewDummyCmdObjBuilder(runner ICmdObjRunner) *CmdObjBuilder {
 }
 
 var dummyPlatform = &Platform{
-	OS:                   "darwin",
-	Shell:                "bash",
-	InteractiveShell:     "bash",
-	ShellArg:             "-c",
-	InteractiveShellArg:  "-i",
-	InteractiveShellExit: "; exit $?",
-	OpenCommand:          "open {{filename}}",
-	OpenLinkCommand:      "open {{link}}",
+	OS:              "darwin",
+	Shell:           "bash",
+	ShellArg:        "-c",
+	OpenCommand:     "open {{filename}}",
+	OpenLinkCommand: "open {{link}}",
 }
 
 func NewDummyOSCommandWithRunner(runner *FakeCmdObjRunner) *OSCommand {