Fix organization multitenant issue with meeting's reminders

[alecslupu]

🎩 What? Why?

This PR fixes a scenario where CloseMeetingReminder is sending Meeting Reminders to any admin user in any organization.

📌 Related Issues

Link your PR to an issue

• Fixes Admin notifications cross instances #12502

Testing

1. Create 2 organizations inside a single installation
2. Invite admins
3. In one organziation create an official meeting
4. Allow the event to end ( or set the end date in the past )
5. Send the reminders
6. See both admin users receives the notification
7. Apply patch
8. Repeat 3,4,5
9. See only the organization admin in which the meeting has been created receives the notification.

📷 Screenshots

Please add screenshots of the changes you are proposing

♥️ Thank you!

[andreslucena]

@alecslupu can you fill the templates? FYI, I receive an email notification that doesn't bring much information:

[andreslucena]

Checked it out locally. It works as expected, and code-wise looks great!

[microstudi]

@andreslucena is this going to be backported to 0.27?

[andreslucena]

@andreslucena is this going to be backported to 0.27?

Yes, FYI, this is the current set of backports in the backlog:

ID	Title	Backport v0.28	Backport v0.27
#12880	Fix external URL with a fragment	None	None
#12877	Remove unecessary accordion in Conferences' program	None	None
#12875	Add proposal author when exporting proposals	None	None
#12864	Fix exception when going to debates new URL directly as non-logged user	None	None
#12858	Prevent showing the dropdown menu when changing orientation of mobile devices	None	None
#12857	Fix strings for ordering when listing budgets	None	None
#12849	Remove sidebar when conference has no components	#12863	None
#12847	Fix 500 error when creating or updating an organization without a secret key	#12862	None
#12843	Fix exceptions there isn't an organization with a host	#12861	None
#12837	Add organization or application name in emails' From header	#12860	None
#12829	Hide moderated content from notifications	None	None
#12827	Add the rel="nofollow noopener noreferrer" attribute to external links	#12832	None
#12746	Fix several HTML validation issues in redesign	#12859	None
#12709	Fix admin language selector	#12855	None
#12706	Fix broken conference registering when no registration types	#12833	None
#12689	Fix layout in Safari when there are few elements in the page	#12854	None
#12682	Show meeting timezone for visitors and participants	#12787	None
#12671	Fix organization multitenant issue with meeting's reminders	#12838	None
#12636	Fix flaky with accessibility errors in Direct Uploads	#12756	None
#12587	Fix impersonnating users	#12740	None
#12550	Fix newsletter flow in admin panel	#12606	None
#12538	Do not list hidden reported debates in the admin	#12607	None
#12530	Review brakeman configuration	#12609	None
#12529	Improve iframe accessibility	#12748	None
#12517	Accessibility fixes regarding links that open in new tabs	#12739	None
#12513	Fix some accessibility issues with comments	#12834	None
#12324	Fix a11y "page-has-heading-one" warning for some pages in the admin panel	#12429	None

(The ones that have None will be backported if they're relevant to that version)

This is done with an internal tool (decidim-backports-checker from https://github.com/decidim/decidim-maintainers_toolbox/)

I'll handle this particular backport this week.