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/app/modules/smtp-table/smtp-table.component.html

@@ -93,6 +93,18 @@
               <i class="las la-times-circle"></i>
             </button>
 
+            <button
+              actions
+              [disabled]="(['iam.write'] | hasRole | async) === false"
+              mat-icon-button
+              color="primary"
+              matTooltip="{{ 'SMTP.LIST.TEST' | translate }}"
+              data-e2e="test-provider-button"
+              (click)="testSMTPConfig(config.id); $event.stopPropagation()"
+            >
+              <i class="las la-flask"></i>
+            </button>
+
             <button
               actions
               [disabled]="(['iam.write'] | hasRole | async) === false"