Fixing yarn version command, adding yarn version plugin (#17325)

* Removing invalid flags for yarn version command

* Adding yarn version plugin

* remove .yarn from coverage

---------

Co-authored-by: Brad Decker <bhdecker84@gmail.com>

coverage-targets.js

@@ -6,10 +6,10 @@
 // subset of files to check against these targets.
 module.exports = {
   global: {
-    branches: 20,
-    functions: 30,
-    lines: 57,
-    statements: 40,
+    branches: 50,
+    functions: 55,
+    lines: 62.25,
+    statements: 61.5,
   },
   transforms: {
     branches: 100,

nyc.config.js

@@ -0,0 +1,17 @@
+// nyc is our coverage reporter for mocha, and currently is collecting
+// coverage for .yarn folder. all of these are default excludes except the
+// .yarn/** entry. This entire file should be removable once we complete the
+// migration from mocha to jest in the app folder.
+module.exports = {
+  exclude: [
+    'coverage/**',
+    'packages/*/test/**',
+    'test/**',
+    'test{,-*}.js',
+    '**/*{.,-}test.js',
+    '**/__tests__/**',
+    '**/node_modules/**',
+    '**/babel.config.js',
+    '.yarn/**',
+  ],
+};