Run some tests against only latest and nightly-latest CLIs

These features have stabilized so it isn't that helpful to test them against the full range of CLIs.  So let's speed up the PR checks and save some Actions minutes.

Author: henrymercer

.github/workflows/__go-custom-queries.yml

@@ -1,5 +1,10 @@
 name: "Go: Custom queries"
 description: "Checks that Go works in conjunction with a config file specifying custom queries"
+operatingSystems:
+  - ubuntu
+versions:
+  - latest
+  - nightly-latest
 env:
   DOTNET_GENERATE_ASPNET_CERTIFICATE: "false"
 steps:

.github/workflows/__remote-config.yml

@@ -1,5 +1,10 @@
 name: "Remote config file"
 description: "Checks that specifying packages using only a config file works"
+operatingSystems:
+  - ubuntu
+versions:
+  - latest
+  - nightly-latest
 steps:
   - uses: ./../action/init
     with:

.github/workflows/__unset-environment.yml

@@ -1,7 +1,10 @@
 name: "Test unsetting environment variables"
 description: "An end-to-end integration test that unsets some environment variables"
-operatingSystems: ["ubuntu"]
-
+operatingSystems:
+  - ubuntu
+versions:
+  - latest
+  - nightly-latest
 steps:
   - uses: ./../action/init
     id: init