[DO NOT MERGE] Rename 'channels' app to 'ocs_channels'

[snopoke]

Warning

Do not merge.
This will be merged during the maintenance window.

Description

This renames the 'channels' app in preparation from adding the Django channels app to avoid a name clash.

The approach I've gone with is to keep the DB schema untouched but to change the app label. This is possible by setting the db_table on the model Meta class.

This will require a maintenance window in order to update references to the app label in the database (migrations and content type). See #1602

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/experiments/views/experiment.py	33.33%	2 Missing ⚠️

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[SmittieC]

LGTM