SS-1478 Add email sending functionality and templates for account notifications

[churnikov]

Description

Now there is an email sending table

That you can use to send emails

Emails are sent on object's save, that means, that if email was not sent you can edit it and send it again.

As this PR modifies settings.py file, here is the pr in serve-charts: ScilifelabDataCentre/serve-charts#99

Checklist

If you're unsure about any of the items below, don't hesitate to ask. We're here to help!
This is simply a reminder of what we are going to look for before merging your code.

• This pull request is against develop branch (not applicable for hotfixes)
• I have included a link to the issue on GitHub or JIRA (if any)
• I have included migration files (if there are changes to the model classes)
• I have included, reviewed and executed tests (unit and end2end) to complement my changes -> TODO add manual test case
• I have updated the related documentation (if necessary) -> TODO add info about this on this page https://scilifelab.atlassian.net/wiki/x/dQChow
• I have added a reviewer for this pull request
• I have added myself as an author for this pull request
• In the case I have modified settings.py, then I have also updated the studio-settings-configmap.yaml file in serve-charts

Further comments

Anything else you think we should know before merging your code!

[Copilot]

Pull Request Overview

This PR adds a new manual email-sending feature and accompanying templates for account notifications.

• Introduces base and specific email templates for account status updates.
• Configures EMAIL_TEMPLATES, email backend, and default sender addresses in settings.
• Implements EmailSendingTable model, Celery task, signal handlers, and admin integration for manual email workflows.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
templates/admin/email/base.html	Adds base HTML layout and styling for all notification emails.
templates/admin/email/user-in-not-from-a-swedish-uni.html	New template for non-Swedish-affiliated account notification.
templates/admin/email/account-enabled-email.html	New template for account-enabled notification.
studio/settings.py	Loads all email templates, sets up email backend and default senders.
common/tasks.py	Updates send_email_task signature to accept from_email.
common/signals.py	Adds pre-save signal to trigger manual email sending on save.
common/models.py	Defines EmailSendingTable with email rendering and send logic.
common/migrations/0002_emailsendingtable.py	Migration to create EmailSendingTable.
common/admin.py	Registers EmailSendingTable in Django admin with custom admin class.

Comments suppressed due to low confidence (2)

common/tasks.py:156

• The docstring above does not mention the new from_email parameter; please update it to reflect this addition.

    from_email: str = settings.EMAIL_FROM,

common/signals.py:47

• Using a pre_save signal to send emails and update status can trigger another save and lead to recursion. Consider switching to a post_save handler and guarding on created or current status to prevent repeated sends.

        instance.send_email()

[Copilot]

Fix the grammatical error: change 'request an account' to 'requested an account'.

Suggested change

	You have request an account on our service SciLifeLab Serve (<a href="https://serve.scilifelab.se">https://serve.scilfielab.se</a>). Our service is only available to researchers affiliated with a Swedish university or their collaborators who need to work with them on the service. Your email is not related to a Swedish university, however.
	You have requested an account on our service SciLifeLab Serve (<a href="https://serve.scilifelab.se">https://serve.scilfielab.se</a>). Our service is only available to researchers affiliated with a Swedish university or their collaborators who need to work with them on the service. Your email is not related to a Swedish university, however.

[Copilot]

Rendering templates with only message in context may break templates that reference other variables (e.g., user). Ensure you pass all required context or update templates to only use the provided data.

Suggested change

	html_message = render_to_string(self.template, {"message": self.message})
	html_message = render_to_string(
	self.template,
	{
	"message": self.message,
	"subject": self.subject,
	"to_user": self.to_user,
	"to_email": self.to_email,
	}
	)

[anondo1969]

LGTM.