Update to BuildGrammar 2.1.0 (#1239)

- Adds current tests to /Tools/GrammarTesting
- Adds testing framework tarball to /.github/workflows/dependencies
- Updates BuildGrammar nupkg to 2.1.0
- Updates grammar-validator.yaml & validate-grammar.sh

Co-authored-by: Nigel-Ecma <[email protected]>

Author: Nigel-Ecma

.github/workflows/dependencies/EcmaTC49.BuildGrammar.2.0.0.nupkg renamed to .github/workflows/dependencies/EcmaTC49.BuildGrammar.2.1.0.nupkg

@@ -27,15 +27,15 @@ jobs:
         dotnet-version: 8.0.x
 
     - name: Set up JDK 15
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v2
       with:
         java-version: 15.0
+        distribution: zulu
 
       # Install build grammar global tool
     - name: Install BuildGrammar tool
       run: |
-        dotnet tool install --version 2.0.0 --global --add-source ./.github/workflows/dependencies/ EcmaTC49.BuildGrammar
-    
+        dotnet tool install --version 2.1.0 --global --add-source ./.github/workflows/dependencies/ EcmaTC49.BuildGrammar
 
     - name: run validate
       run: |

.github/workflows/dependencies/GrammarTestingEnv.tgz

@@ -0,0 +1,10 @@
+# Parsing Tests
+
+There are two sets of tests. The standard set, in `Samples`, test whether the Standard’s
+grammar is producing the expected parse.
+
+The second set, in `Demo`, exist to demonstrate the system and are run when `SetupAndTest`
+or `DoParsingTests` are passed the `-d` option.
+
+If `Demo` is not here it will be in the environment parallel which can be located using the
+environment variable `BG_LIB_PARSINGTESTS`.