[Task-979] Remove submission counter and add organization name to header if MMO is enabled

[duvld]

Checklist

1. If you've added code that should be tested, add tests
2. If you've changed APIs, update (or create!) the documentation
3. Ensure the tests pass
4. Run ./python-format.sh to make sure that your code lints and that you've followed our coding style
5. Write a title and, if necessary, a description of your work suitable for publishing in our release notes
6. Mention any related issues in this repository (as #ISSUE) and in other repositories (as kobotoolbox/other#ISSUE)
7. Open an issue in the docs if there are UI/UX changes
8. Create a testing plan for the reviewer and add it to the Testing section
9. Add frontend or backend tag and any other appropriate tags to this pull request

Description

Adds a badge that displays the organization name of the MMO that the user is part of. Empty if not part of an MMO.

Removes the submission counter entirely.

Notes

When removing the submission counter I only found a bem related to the mainHeader component. I checked the code a few times to make sure some weird stuff wasn't happening that depended on this UI component and I found nothing.

There is no character limit on the org name being displayed. We can possibly have extremely long names but it seems unlikely.

Testing

Enable MMO on user org and check the name to see if it's reflected in the badge.

[notion-workspace]

Add org name badge to app header nav

[jamesrkiger]

lgtm