chore: Make Node.js 24 variants optional, so they don't block releases

Node.js 24 variants are going to be broken for a while, while we
work on the upgrade. It doesn't make much sense to keep them
running and blocking CI, so we will disable them by default and
only run them when a patch asks for it.

Author: kmruiz

.evergreen/build-variants/unit-tests-build-variants.js

@@ -13,6 +13,7 @@ for (const {
   shortName: nShort,
   versionSpec: nVersion,
   skipNodeVersionCheck,
+  optional,
 } of NODE_VERSIONS) {
   for (const platform of PLATFORMS) {
     const platformDetails = platformToDetails[platform];
@@ -64,6 +65,7 @@ for (const {
         mShort,
         mVersion,
         skipNodeVersionCheck,
+        disabled: optional === true,
       });
     }
   }

.evergreen/constants.js

@@ -55,5 +55,6 @@ exports.NODE_VERSIONS = [
     shortName: '24',
     versionSpec: NODE_JS_VERSION_24,
     skipNodeVersionCheck: '',
+    optional: true,
   },
 ];

.evergreen/evergreen.yml.in

@@ -1560,6 +1560,7 @@ buildvariants:
     display_name: "<% out(variant.displayName) %>"
     run_on: <% out(variant.runOn) %>
     tags: <% out(variant.tags) %>
+    disabled: <% out(variant.disabled) %>
     expansions:
       executable_os_id: <% out(variant.executableOsId) %>
       mongosh_server_test_version: "<% out(variant.mVersion || '') %>"