Increase default macOS toolchain setup time

This should help avoid timeouts without users having to manually override this value. They can manually override it if they want to bring it down

#17519

Closes #17522.

PiperOrigin-RevId: 513258515
Change-Id: I2621b697643d4a1d6dc9db8ccee521f9ba0ce3dd

tools/osx/xcode_configure.bzl

@@ -17,7 +17,7 @@
    installed on the local host.
 """
 
-OSX_EXECUTE_TIMEOUT = 120
+OSX_EXECUTE_TIMEOUT = 600
 
 def _search_string(fullstring, prefix, suffix):
     """Returns the substring between two given substrings of a larger string.