Added: Add 'active' field to ExperimentCollection model and allow admin user to deactive an experiment collection

[drikusroor]

This pull request adds an 'active' field to the ExperimentCollection model, allowing experiment collections to be marked as active or inactive. If an experiment collection is marked as active, it will return a 404 not found when requested through the get_experiment_collection endpoint. It also updates the ExperimentCollectionAdmin views to include the 'active' field in the list display and form fields. Additionally, it includes a fix for a test related to the experiment series admin list display.

Resolves #1124

[sentry-io[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: backend/experiment/views.py

Function	Unhandled Issue
get_experiment_collection	ValueError: min() arg is an empty sequence /serve... Event Count: 7
get_experiment_collection	Participant.DoesNotExist: Participant matching query does not exist. /server/experimen... Event Count: 3

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