[WEB-5430] feat: allow users to change email (#8120)

* feat: change user email

* chore: optimised the logic

* feat: add email change functionality and related modals in profile form

* refactor: format checkEmail method for improved readability

* chore: added rate limit exceeded validation

* feat: implement change email modal with localization support

- Added translation support for the change email modal, including titles, descriptions, and error messages.
- Integrated the useTranslation hook for dynamic text rendering.
- Updated form validation messages to utilize localized strings.
- Enhanced user feedback with localized success and error toast messages.
- Updated button labels and placeholders to reflect localization changes.

* chore: added extra validation in cache key

* fix: format files

---------

Co-authored-by: b-saikrishnakanth <bsaikrishnakanth97@gmail.com>
Co-authored-by: sriramveeraghanta <veeraghanta.sriram@gmail.com>

apps/api/plane/bgtasks/user_email_update_task.py

@@ -0,0 +1,110 @@
+# Python imports
+import logging
+
+# Third party imports
+from celery import shared_task
+
+# Django imports
+from django.core.mail import EmailMultiAlternatives, get_connection
+from django.template.loader import render_to_string
+from django.utils.html import strip_tags
+
+# Module imports
+from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.exception_logger import log_exception
+
+
+@shared_task
+def send_email_update_magic_code(email, token):
+    try:
+        (
+            EMAIL_HOST,
+            EMAIL_HOST_USER,
+            EMAIL_HOST_PASSWORD,
+            EMAIL_PORT,
+            EMAIL_USE_TLS,
+            EMAIL_USE_SSL,
+            EMAIL_FROM,
+        ) = get_email_configuration()
+
+        # Send the mail
+        subject = "Verify your new email address"
+        context = {"code": token, "email": email}
+
+        html_content = render_to_string("emails/auth/magic_signin.html", context)
+        text_content = strip_tags(html_content)
+
+        connection = get_connection(
+            host=EMAIL_HOST,
+            port=int(EMAIL_PORT),
+            username=EMAIL_HOST_USER,
+            password=EMAIL_HOST_PASSWORD,
+            use_tls=EMAIL_USE_TLS == "1",
+            use_ssl=EMAIL_USE_SSL == "1",
+        )
+
+        msg = EmailMultiAlternatives(
+            subject=subject,
+            body=text_content,
+            from_email=EMAIL_FROM,
+            to=[email],
+            connection=connection,
+        )
+        msg.attach_alternative(html_content, "text/html")
+        msg.send()
+        logging.getLogger("plane.worker").info("Email sent successfully.")
+        return
+    except Exception as e:
+        log_exception(e)
+        return
+
+
+@shared_task
+def send_email_update_confirmation(email):
+    """
+    Send a confirmation email to the user after their email address has been successfully updated.
+
+    Args:
+        email: The new email address that was successfully updated
+    """
+    try:
+        (
+            EMAIL_HOST,
+            EMAIL_HOST_USER,
+            EMAIL_HOST_PASSWORD,
+            EMAIL_PORT,
+            EMAIL_USE_TLS,
+            EMAIL_USE_SSL,
+            EMAIL_FROM,
+        ) = get_email_configuration()
+
+        # Send the confirmation email
+        subject = "Plane email address successfully updated"
+        context = {"email": email}
+
+        html_content = render_to_string("emails/user/email_updated.html", context)
+        text_content = strip_tags(html_content)
+
+        connection = get_connection(
+            host=EMAIL_HOST,
+            port=int(EMAIL_PORT),
+            username=EMAIL_HOST_USER,
+            password=EMAIL_HOST_PASSWORD,
+            use_tls=EMAIL_USE_TLS == "1",
+            use_ssl=EMAIL_USE_SSL == "1",
+        )
+
+        msg = EmailMultiAlternatives(
+            subject=subject,
+            body=text_content,
+            from_email=EMAIL_FROM,
+            to=[email],
+            connection=connection,
+        )
+        msg.attach_alternative(html_content, "text/html")
+        msg.send()
+        logging.getLogger("plane.worker").info(f"Email update confirmation sent successfully to {email}.")
+        return
+    except Exception as e:
+        log_exception(e)
+        return