Remove sourcecast and sourcereel

[RichDom2185]

Unused features, to be deleted to focus on core features

[gemini-code-assist]

Code Review

This pull request removes the Sourcecast feature entirely from the application, including its database schema, configuration, S3 bucket resources, IAM policies, controllers, views, routes, and associated tests. However, a critical issue was identified in test/cadet/courses/courses_test.exs, where leftover references to enable_sourcecast and a remaining describe Sourcecast block will cause compilation and test failures.

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[gemini-code-assist]

Although Sourcecast and SourcecastUpload have been removed from the aliases, there are still several references to enable_sourcecast and a whole describe "Sourcecast" block remaining in this test file.\n\nSpecifically:\n- enable_sourcecast is still used in the parameters and assertions of describe "create course config", describe "get course config", and describe "update course config" (e.g., lines 26, 62, 89, 99, 117, 129, 147).\n- The entire describe "Sourcecast" block (lines 553-583) remains at the end of the file and references the deleted Sourcecast and SourcecastUpload modules, as well as the deleted Courses.upload_sourcecast_file and Courses.delete_sourcecast_file functions.\n\nThese leftover references will cause compilation and test failures. Please clean up all remaining references to Sourcecast, SourcecastUpload, and enable_sourcecast in this file.

[coveralls]

Coverage is 87.422% — remove-sourcecast-sourcereel into master. No base build found for master.