build-script: remove --verbose when building swiftpm

The SwiftPM stage added `--verbose` in swiftlang#79330 to help troubleshoot build
error that were occuring on Linux.  These errors have since been
addresed, but the verbosity was not removed.

Remove the `--verbose` command line argument in the SwiftPM portion of
the `build-script`.

Author: bkhouri

utils/swift_build_support/swift_build_support/products/swiftpm.py

@@ -124,7 +124,6 @@ def build(self, host_target):
             host_target,
             additional_params=[
                 "--reconfigure",
-                "--verbose",
             ],
         )
 
@@ -137,7 +136,6 @@ def test(self, host_target):
             host_target,
             compile_only_for_running_host_architecture=True,
             additional_params=[
-                '--verbose'
             ]
         )
 
@@ -155,7 +153,6 @@ def install(self, host_target):
         install_prefix = install_destdir + self.args.install_prefix
 
         self.run_bootstrap_script('install', host_target, [
-            '--verbose',
             '--prefix', install_prefix
         ])