feat: send test mail (#7968)

# Which Problems Are Solved

- Zitadel doesn't have a way to test SMTP settings either before
creating a new provider or once the SMTP provider has been created.
- Zitadel SMTP messages can be more informative for usual errors

# How the Problems Are Solved

- A new step is added to the new/update SMTP provider wizard that allows
us to test a configuration. The result is shown in a text area.
- From the table of SMTP providers you can test your settings too.
- The email address to send the email is by default the email address
for the logged in user as suggested.
- Some of the SMTP error messages have been changed to give more
information about the possible situation. For example: could not contact
with the SMTP server, check the port, firewall issues... instead of
could not dial

Here's a video showing this new option in action:


https://github.com/zitadel/zitadel/assets/30386061/50128ba1-c9fa-4481-8eec-e79a3ca69bda

# Additional Changes

Replace this example text with a concise list of additional changes that
this PR introduces, that are not directly solving the initial problem
but are related.
For example:
- The docs explicitly describe that the property XY is mandatory
- Adds missing translations for validations.

# Additional Context

- Closes #4504

console/src/assets/i18n/en.json

@@ -486,6 +486,7 @@
     "MORE": "more",
     "STEP": "Step",
     "SETUP": "Setup",
+    "TEST": "Test",
     "UNSAVEDCHANGES": "Unsaved changes",
     "UNSAVED": {
       "DIALOG": {
@@ -2259,6 +2260,7 @@
       "ACTIVATED": "Activated",
       "ACTIVATE": "Activate provider",
       "DEACTIVATE": "Deactivate provider",
+      "TEST": "Test your provider",
       "TYPE": "Type",
       "DIALOG": {
         "ACTIVATED": "SMTP config has been activated",
@@ -2270,7 +2272,11 @@
         "DELETE_TITLE": "Delete SMTP config",
         "DELETE_DESCRIPTION": "You are about to delete a configuration. Confirm this action typing the sender name",
         "DELETED": "SMTP config has been deleted",
-        "SENDER": "Type {{value}}, to delete this SMTP configuration."
+        "SENDER": "Type {{value}}, to delete this SMTP configuration.",
+        "TEST_TITLE": "Test your SMTP config",
+        "TEST_DESCRIPTION": "Specify an email address to test your SMTP configuration for this provider",
+        "TEST_EMAIL": "Email address",
+        "TEST_RESULT": "Test result"
       }
     },
     "CREATE": {
@@ -2282,7 +2288,6 @@
         "CURRENT_DESC_TITLE": "These are your SMTP settings",
         "PROVIDER_SETTINGS": "SMTP Provider Settings",
         "SENDER_SETTINGS": "Sender Settings",
-        "TEST_SETTINGS": "Test SMTP Settings",
         "NEXT_STEPS": "Next Steps",
         "ACTIVATE": {
           "TITLE": "Activate your SMTP Provider",
@@ -2291,6 +2296,12 @@
         "DEACTIVATE": {
           "TITLE": "Deactivate your SMTP Provider",
           "DESCRIPTION": "If you deactivate this SMTP Provider, ZITADEL cannot use it to send notifications until you activate it again."
+        },
+        "SAVE_SETTINGS": "Save your settings",
+        "TEST": {
+          "TITLE": "Test your settings",
+          "DESCRIPTION": "You can test your SMTP provider settings and check the test result before saving them",
+          "RESULT": "Your email was succesfully sent"
         }
       }
     },