chore: [#187578669] disable auto tests in content-repo on commits

Description

This pull request resolves #187578669.

Update config.yml by:
- Disabling the auto test for content on commits
- Adding a scheduled job to run the build and test suit against the content-repo daily

[X] I have rebased this branch from the latest main branch
[X] I have performed a self-review of my code
[X] I have created and/or updated relevant documentation on the engineering documentation website
[X] I have not used any relative imports
[X] I have pruned any instances of unused code
[X] I have not added any markdown to labels, titles and button text in config
[X] If I added/updated any values in userData (including profileData, formationData etc), then I added a new migration file
[X] I have checked for and removed instances of unused config from CMS
[X] If I added any new collections to the CMS config, then I updated the search tool and cmsCollections.ts (see CMS Additions in Engineering Reference/FAQ on the engineering documentation site)
[X] I have updated relevant .env values in both .env-template and in Bitwarden