CSHARP-5772: Fix EFCore tests in Driver's CI (#1798)

Author: sanych-sun

evergreen/evergreen.yml

@@ -1909,11 +1909,7 @@ tasks:
             LOCAL_PATH: ${workdir}/efcore
             SCRIPT: |
               ${PREPARE_SHELL}
-              if [[ $OS =~ [Ww]indows.* ]]; then
-                export ATLAS_URI=Disabled
-              fi
-
-              CRYPT_SHARED_LIB_PATH="${CRYPT_SHARED_LIB_PATH}" DRIVER_VERSION="${PACKAGE_VERSION}" MONGODB_VERSION="${VERSION}" bash ./evergreen/run-tests.sh
+              ATLAS_URI=Disabled CRYPT_SHARED_LIB_PATH="${CRYPT_SHARED_LIB_PATH}" DRIVER_VERSION="${PACKAGE_VERSION}" MONGODB_VERSION="${VERSION}" bash ./evergreen/run-tests.sh
 
     - name: x509-auth-tests
       commands: