Revert "SUST-35 Implementation of course_key_from_string_or_404 to return course_key or raise a 404"

-Adressed all comments

Revert "Added staff role on ccx to staff of master course and added a data migration for existing ccx courses."

This reverts commit 91bf48fc.

request.POST to eliminate Django deprecation messages.

Added staff role on ccx to staff of master course and added a data migration for existing ccx courses.

- Rename escape_json_dumps to dump_js_escaped_json
- Rename escape_js_string to js_escaped_string
- Update js_escaped_string to output empty string for None
- Introduce dump_html_escaped_json
- Move dump_js_escaped_json after the pipe as new best practice
- Introduce additional uses of helpers
- Introduce new djangolib directory and move js_utils

Specific user cannot access studio.edge.edx.org/home

added unit tests and fixed JS tests

added bok choy tests

fixed broken botchoy tests

fixed course discovery broken test

removed monkey patch at class level

changes after feedback from matte

The Programs authoring app is a Backbone SPA maintained in a separate repository. The app handles its own routing and provides a UI which can be used to create and publish new Programs (e.g, XSeries). ECOM-2598.

Extends the Programs ConfigurationModel, cleans up Programs-related utilities and corresponding tests, and corrects caching. Uses the Programs API to list programs within Studio. ECOM-2769.

changing default value instead of setting it via fields

fixed broken test

fixed quality violation

following another approach

Make escaping for json simpler and more consistent in Mako templates
- add escape_json_dumps to escape and json.dumps
- add escape_js_str to escape javascript string
- refactor Studio to use escape_json_dumps in Mako templates

TNL-2646: Escape json.dumps

- Resolve SEC-27 by escaping course name in advanced settings
- Add escape_json_dumps to simplify escaping json in Mako templates

SEC-27: XSS/JS Error in Advanced Settings with invalid course name

TNL-3643

Applying a security patch from last week that has made its way through
the disclosure period already. FYI @robrap

changes after feedback from Matt D

set default value of entrance_exams feature flags to false

TNL-2694

Add accessibility aria-readonly attributes

This reverts commit 4c1c4619.

PLAT-295

Change name of method to clear up confusion with the access.has_access method.

Display warning message on course outline in Studio when course contains deprecated features/components

TNL-2303