Fix cypress suite

- split out cypress tests for plugins to be isolated
- use updated testca image from proper location

backend/certbot/dns-plugins.json

@@ -553,7 +553,7 @@
 	},
 	"powerdns": {
 		"credentials": "dns_powerdns_api_url = https://api.mypowerdns.example.org\ndns_powerdns_api_key = AbCbASsd!@34",
-		"dependencies": "PyYAML>=6.0.1",
+		"dependencies": "acme=={{certbot-version}}",
 		"full_plugin_name": "dns-powerdns",
 		"name": "PowerDNS",
 		"package_name": "certbot-dns-powerdns",

backend/lib/certbot.js

@@ -37,6 +37,7 @@ const installPlugin = async (pluginKey) => {
 				.map((d) => `'${d}'`)
 				.join(" ")
 		: "";
+
 	const cmd = `. /opt/certbot/bin/activate && pip install --no-cache-dir ${quotedDeps} '${plugin.package_name}${plugin.version}' && deactivate`;
 	return utils
 		.exec(cmd, { env })