Remove xtrace option in scripts

Author: alcaeus

.evergreen/install-dependencies.sh

@@ -1,5 +1,4 @@
 #!/bin/sh
-set -o xtrace   # Write all commands first to stderr
 set -o errexit  # Exit the script with error if any of the commands fail
 
 install_extension ()

.evergreen/run-tests.sh

@@ -1,5 +1,4 @@
 #!/bin/sh
-set -o xtrace   # Write all commands first to stderr
 set -o errexit  # Exit the script with error if any of the commands fail
 
 # Supported/used environment variables: