[lldb] Fixed the test TestGdbRemoteAttachWait running on a remote target (#92413)

Install `_exe_to_attach` to a remote target if necessary.

Author: slydiman

lldb/test/API/tools/lldb-server/attach-wait/TestGdbRemoteAttachWait.py

@@ -17,7 +17,10 @@ def _set_up_inferior(self):
             # Use a shim to ensure that the process is ready to be attached from
             # the get-go.
             self._exe_to_run = "shim"
-            self._run_args = [self.getBuildArtifact(self._exe_to_attach)]
+            self._exe_to_attach = lldbutil.install_to_target(
+                self, self.getBuildArtifact(self._exe_to_attach)
+            )
+            self._run_args = [self._exe_to_attach]
             self.build(dictionary={"EXE": self._exe_to_run, "CXX_SOURCES": "shim.cpp"})
         else:
             self._exe_to_run = self._exe_to_attach