Removed macOS 10.13 builds; Azure DevOps agents are being deprecated (#166)

Co-authored-by: Jin Yan <jiyan2@microsoft.com>

CI/CI.yaml

@@ -110,14 +110,6 @@ stages:
           job_display_name: "CentOS 7-x64-GCC 4.8.5"
           operating_system: Linux
 
-      - template: "templates/BuildAndTest.job_template.yaml"
-        parameters:
-          agent_pool: macOS-10.13
-          configuration: system_compiler
-          job_display_name: "MacOS 10.13-x64-Clang Apple 11.0.0"
-          job_name_unique_id: "1013"
-          operating_system: MacOS
-
       - template: "templates/BuildAndTest.job_template.yaml"
         parameters:
           agent_pool: FeaturizersLibrary

CI/PR.yaml

@@ -96,14 +96,6 @@ stages:
           job_display_name: "CentOS 7-x64-GCC 4.8.5"
           operating_system: Linux
 
-      - template: "templates/BuildAndTest.job_template.yaml"
-        parameters:
-          agent_pool: macOS-10.13
-          configuration: system_compiler
-          job_display_name: "MacOS 10.13-x64-Clang Apple 10.0.0"
-          job_name_unique_id: "1013"
-          operating_system: MacOS
-
       - template: "templates/BuildAndTest.job_template.yaml"
         parameters:
           agent_pool: FeaturizersLibrary