Revert "Revert "ARCHBOM-1494: Refer to custom attributes, not metrics, especially with edx-django-utils (#25010)" (#25025)" (#25055)

This reverts commit 986a448d.

Revert "ARCHBOM-1494: Refer to custom attributes, not metrics, especially with edx-django-utils (#25010)" (#25025)

This reverts commit ba9ee4e1.

Fixed Style lint issue

This uses the new names introduced in edx-django-utils
3.8.0 (edx/edx-django-utils#59), which we're already using, as
well as updating a few other locations where we incorrectly refer
to New Relic custom metrics instead of custom attributes.

Includes a couple of unrelated lint fixes in a file I modified.

This also starts taking priority into account for all tabs, and
not just dynamic tabs via the CourseTabPluginManager (see comments
in the code for more detail)

This also has an initial use case for Personalized Learner Schedules
to add CTAs to capa and vertical blocks to allow users to shift their
course deadlines.

When considering if an assignment is past due for the dates tab,
only look at the scored and graded units in the subsection (i.e.
ignore reading and video units).

This still leaves the "complete" field alone -- i.e. those
subsections will still be left incomplete generally. But for
assignment-focused tasks, they will instead be considered complete.

This switches the Dates Tab to be an enrolled tab allowing only
enrolled learners to view. Additionally, it will now redirect
logged out learners to the login page if they hit the Dates Tab directly.

There were two get_transcript methods. The broken one that was being
used (VideoTranscriptsMixin.get_transcript) is stripped out here - it
has been superseded by transcripts_utils.get_transcript. The latter
includes support for blockstore and VAL, while the former did not.

This fixes the `AttributeError: 'LibraryLocatorV2' object has no
attribute 'make_asset_key'` error seen when attempting to load a
transcript from a video through the xblock api when the video had the
transcript stored in blockstore.

Note that if you were previously using video.get_transcript, you should
now use `transcripts_utils.get_transcript(video, ...)`, and note that
the returned 'filename' will be prefixed with the language code, as
other `get_transcript*` functions already do.

- Looks at masquerading config for dates, outline, metadata, and
  celebration APIs in course_home_api / courseware_api.
- Consolidates and cleans up places we check whether masquerading
  gives us full access to a course.

* Replace track calls with eventtracking in task_track and server_track

* Making  events compatible with events emitted via track app

* Fixed broken tests and quality violation

* Removed useless changes in shim. using  in  to have  and  keys in event context

Co-authored-by: zia.fazal@arbisoft.com <zia.fazal@arbisoft.com>

This PR solves the DeprecationWarning mentioned in:
https://build.testeng.edx.org/job/edx-platform-python-pipeline-master/warning_5freport_5fall_2ehtml/

HTMLParser was renamed in html.parser in Python3:
https://docs.python.org/2/library/htmlparser.html#module-HTMLParser

* html_parser.HTMLParser().unescape from six.moves has been deprecated

* instead use html.unescape from Python3

Documentation for unescape in Python3:
https://docs.python.org/3/library/html.html#html.unescape

- html_parser from six.moves has been deprecated

- instead use html.parser from Python3

- Order imports using isort

- Delete unused import crum

Appending the assignment type to each graded
assignment on the Dates Tab. Exposed the 'format'
field, which corresponds to the graded assignment type.

Reducing dates widget to one assignment. Adding link to dates
page in the dates widget

in favor of display in the Staff Instructor Toolbar.

This takes over some of the logic in the is_enabled property which
previously checked two things: (1) is the date time-sensitive and
(2) is the date even applicable to this course.

Now, is_enabled is only responsible for time-sensitive checks and
the new is_allowed property checks applicability.

In this way, we can more cleanly separate whether a date block
should show up on the dates sidebar (is_enabled and is_allowed)
and the dates tab (is_allowed).

This change will prefer putting assignments before other course
events (such as end date or verification deadline date) in the
case where they share the same date.

- use new dates banner template on course outline page
- remove old banner from main.html
- let dates tab use new dates banner template
- remove dates banner completely from the courseware problem view
  on the web app
- use new banner on the courseware problem view on the mobile app
- update banner util to use get_course_blocks

Remove code from the courseware index page that was only relevant if the shopping cart was enabled.

Remove all references to the shoppingcart app from the course about page. Also removed one test of shoppingcart functionality from the student app.

Add financial assistance link in course tools where available, so this will be more visible to learners

This reverts commit cbb4cfb9.

Add financial assistance link in course tools for eligible courses, so it'll be more visible to learners

[AA-138]