Remove testing of "latest" server on 4.0 branch

Author: jyemin

.evergreen/.evg.yml

@@ -503,13 +503,6 @@ axes:
   - id: version
     display_name: MongoDB Version
     values:
-      - id: "latest"
-        display_name: "latest"
-        variables:
-           VERSION: "latest"
-           # Multiple mongos instances can be specified in the connection string
-           # for this version.
-           SAFE_FOR_MULTI_MONGOS: true
       - id: "4.2"
         display_name: "4.2"
         variables:
@@ -650,21 +643,21 @@ buildvariants:
     - name: "static-analysis"
 
 - matrix_name: "tests-zlib-compression"
-  matrix_spec: { compressor : "zlib", auth: "noauth", ssl: "nossl", jdk: "jdk8", version: ["3.6", "4.0", "4.2", "latest"], topology: "standalone", os: "linux" }
+  matrix_spec: { compressor : "zlib", auth: "noauth", ssl: "nossl", jdk: "jdk8", version: ["3.6", "4.0", "4.2"], topology: "standalone", os: "linux" }
   display_name: "${version} ${compressor} ${topology} ${auth} ${ssl} ${jdk} ${os} "
   tags: ["tests-variant"]
   tasks:
      - name: "test"
 
 - matrix_name: "tests-snappy-compression"
-  matrix_spec: { compressor : "snappy", auth: "noauth", ssl: "nossl", jdk: "jdk8", version: ["3.4", "3.6", "4.0", "4.2", "latest"], topology: "standalone", os: "linux" }
+  matrix_spec: { compressor : "snappy", auth: "noauth", ssl: "nossl", jdk: "jdk8", version: ["3.4", "3.6", "4.0", "4.2"], topology: "standalone", os: "linux" }
   display_name: "${version} ${compressor} ${topology} ${auth} ${ssl} ${jdk} ${os} "
   tags: ["tests-variant"]
   tasks:
      - name: "test"
 
 - matrix_name: "tests-zstd-compression"
-  matrix_spec: { compressor : "zstd", auth: "noauth", ssl: "nossl", jdk: "jdk8", version: ["4.2", "latest"], topology: "standalone", os: "linux" }
+  matrix_spec: { compressor : "zstd", auth: "noauth", ssl: "nossl", jdk: "jdk8", version: ["4.2"], topology: "standalone", os: "linux" }
   display_name: "${version} ${compressor} ${topology} ${auth} ${ssl} ${jdk} ${os} "
   tags: ["tests-variant"]
   tasks:
@@ -678,7 +671,7 @@ buildvariants:
      - name: "test"
 
 - matrix_name: "tests-jdk-secure"
-  matrix_spec: { auth: "auth", ssl: "ssl", jdk: ["jdk8", "jdk11"], version: ["4.0", "4.2", "latest"], topology: "*", os: "linux" }
+  matrix_spec: { auth: "auth", ssl: "ssl", jdk: ["jdk8", "jdk11"], version: ["4.0", "4.2"], topology: "*", os: "linux" }
   display_name: "${version} ${topology} ${auth} ${ssl} ${jdk} ${os} "
   tags: ["tests-variant"]
   tasks: