Preserve live adapter command-manifest contracts in unit tests

Keep defaultWindowMode, browser-login, hosted availability exception, and
file-argument checks against plugin-command-manifest.json. Ignore plugin
package-lock.json files created by local install.

Author: ankitranjan7

.gitignore

@@ -3,3 +3,4 @@ dist/
 *.tsbuildinfo
 .DS_Store
 *.log
+plugins/*/package-lock.json