[BD-32] feat: add filter before course home rendering process starts

[mariajgrimaldi]

Description

As part of the Hooks Extension Framework implementation plan, this PR adds a filter before the course home rendering process starts.

Supporting information

• Hooks Extension Framework OEP-50
  ADR(s) on:
• Open edX Filters naming and versioning: about how to identify filters and manage its versions
• Open edX Filters configuration: how to configure filters
• Open edX Filters tooling: what to use to run filters
• Open edX Filters payload: input arguments for filters

Testing instructions

1. Install openedx-filters library:

pip install git+https://github.com/eduNEXT/openedx-filters.git@MJG/template-exceptions#egg=openedx_filters==0.6.0_alpha

We are currently using this version because implements some convenient exceptions for template interactions.
2. Implement your pipeline steps in your favorite plugin. We created some as illustration in openedx-filters-samples. We'll be using those in this example.
3. Install openedx-filters-samples

pip install -e git+https://github.com/eduNEXT/openedx-filters-samples.git@master#egg=openedx_filters_samples

4. Configure your filters:
   With this configuration, you won't be able to:

• Render the course home. Instead, an error will be raised or a different template will be rendered (if you define its path here)

OPEN_EDX_FILTERS_CONFIG = {
     "org.openedx.learning.course_home.render.started.v1": {
            "fail_silently": False,
            "pipeline": [
                "openedx_filters_samples.samples.pipeline.StopCourseHomeRendering",
            ]
    },
}

And with this one, you'll be able to modify course updates text.

OPEN_EDX_FILTERS_CONFIG = {
     "org.openedx.learning.course_home.render.started.v1": {
            "fail_silently": False,
            "pipeline": [
                "openedx_filters_samples.samples.pipeline.ModifyUpdatesFromCourse",
            ]
    },
}

If you want to redirect to your custom course home, then:

OPEN_EDX_FILTERS_CONFIG = {
     "org.openedx.learning.course_home.render.started.v1": {
            "fail_silently": False,
            "pipeline": [
                "openedx_filters_samples.samples.pipeline.RedirectCourseHomeRendering",
            ]
    },
}

[openedx-webhooks]

Thanks for the pull request, @mariajgrimaldi! I've created BLENDED-1119 to keep track of it in Jira. More details are on the BD-32 project page.

When this pull request is ready, tag your edX technical lead.

[mariajgrimaldi]

Closing this PR in favor of PR #29996

[openedx-webhooks]

@mariajgrimaldi Even though your pull request wasn’t merged, please take a moment to answer a two question survey so we can improve your experience in the future.