Revert "sg: execute bash in interactive mode (#42689)" (#42858)

This reverts commit a4ae7a7.

Author: burmudar

dev/sg/internal/usershell/command.go

@@ -37,12 +37,6 @@ func wrap(ctx context.Context, cmd string) wrapped {
 	case ShellType(ctx) == FishShell:
 		w.Command = fmt.Sprintf("fish || true; %s", cmd)
 
-	case ShellType(ctx) == BashShell:
-		// -i sets the bash shell to be interactive, since this IS an interactive step but more importantly
-		// on some platforms (I'm looking at you Ubuntu runner from github actions) the ~/.bashrc file has a section
-		// where it EXITs early out of the bashrc file if it is not running in interactive mode ...
-		w.ShellFlags = []string{"-i", "-c"}
-		w.Command = fmt.Sprintf("source %s || true; %s", ShellConfigPath(ctx), cmd)
 	default:
 		// The above interactive shell approach fails on OSX because the default shell configuration
 		// prints sessions restoration informations that will mess with the output. So we fall back