Merge branch '1120-missing-onlanguage-activation-event-on-package-json' into 'master'

Resolve "Missing onLanguage activation event on package.json"

Closes #1120

See merge request eng/ide/ada_language_server!1171

Author: abdellah257

integration/vscode/ada/package.json

@@ -16,6 +16,8 @@
         "ms-vscode.cpptools"
     ],
     "activationEvents": [
+        "onLanguage:ada",
+        "onLanguage:gpr",
         "onCommand:workbench.action.tasks.runTask"
     ],
     "main": "./out/extension",