E2E: Add SMTP tester (#88392)

* E2E: Add SMTP tester

* fix loadlocation issue when running tests on alpine

* temporary update

* add log

* update run-suite

* Update run-suite

* Update run-suite

* Update run-suite

* Update yarn.lock

* apply suggestions + cleanup logs

* update yarn.lock & package.json

* fix swagger

package.json

@@ -165,6 +165,7 @@
     "css-minimizer-webpack-plugin": "6.0.0",
     "cypress": "13.10.0",
     "cypress-file-upload": "5.0.8",
+    "cypress-recurse": "^1.35.3",
     "esbuild": "0.20.2",
     "esbuild-loader": "4.1.0",
     "esbuild-plugin-browserslist": "^0.12.0",
@@ -217,6 +218,7 @@
     "rudder-sdk-js": "2.48.8",
     "sass": "1.77.4",
     "sass-loader": "14.2.1",
+    "smtp-tester": "^2.1.0",
     "style-loader": "4.0.0",
     "stylelint": "16.6.1",
     "stylelint-config-sass-guidelines": "11.1.0",