feat: replace enterprise support enrollment imports with filter call

[brobro10000]

ENT-11574

Sibling of the openedx/openedx-platform PR of the same name, carrying the same call-site
change to this deployable fork so it can go through stage/prod ahead of the upstream merge,
per the enterprise plugin ticket runbook. Devstack only boots this repo (not
openedx/openedx-platform), so this is also the branch used for local integration testing.

Companion PR to the already-open support-contact-tag PR set (openedx-filters#390,
edx-enterprise#2688, openedx-platform#39076, edx-platform#455) — this one covers the
other half of ENT-11574's acceptance criteria: enterprise enrollment data for the support
enrollment view.

Removes the direct openedx.features.enterprise_support imports and the
_enterprise_course_enrollments_by_course_id helper from EnrollmentSupportListView,
replacing them with a call to the new SupportEnrollmentDataRequested openedx-filter. No
settings changes in this PR: OPEN_EDX_FILTERS_CONFIG registration for the pipeline step
lives entirely in edx-enterprise's own plugin_settings() (enterprise/settings/common.py),
per the ENT-11830 ownership handoff — already merged in this repo (#281) well before this
branch existed.

lms/djangoapps/support/views/contact_us.py is untouched — this PR is scoped to the
enrollment filter only.

Related PRs

• openedx/openedx-filters — new filter: feat: add SupportEnrollmentDataRequested filter openedx/openedx-filters#393
• openedx/edx-enterprise — pipeline step: feat: add SupportEnterpriseEnrollmentDataInjector pipeline step openedx/edx-enterprise#2690
• openedx/openedx-platform — same call-site change upstream, merges last: feat: replace enterprise support enrollment imports with filter call openedx/openedx-platform#39083
• Sibling ticket-half already in review: openedx-filters#390, edx-enterprise#2688,
  openedx-platform#39076, edx-platform#455 (support-contact-tag)

Merge order (per the enterprise plugin ticket runbook)

Merge this after local devstack testing and before the openedx/openedx-platform PR.
Auto-deploys to stage on merge — test in stage, then deploy to prod and confirm working, before
the openedx-platform PR is rebased and merged.

CI note

CI here is expected to be red on Django-app-boot-dependent jobs until openedx-filters and
edx-enterprise are released and this repo's requirements pin is bumped — CI installs the
published PyPI versions, which don't yet contain SupportEnrollmentDataRequested/the new
pipeline step. Not a bug in this diff — it self-resolves per the runbook's release ordering.

Testing

Same test change as the openedx-platform PR: SupportEnrollmentDataRequested.run_filter is
mocked at the call site in lms/djangoapps/support/tests/test_views.py; the pipeline-step
behavior itself is covered by edx-enterprise's own test suite.

Local devstack integration testing (with the openedx-filters, edx-enterprise, and this branch
checked out together) is required before merging.

[pwnage101]

❌ Hm, this is a big red flag that we're passing an empty dict to the filter. You should be passing something useful, like enrollments. Think of it like this: what would a non-enterprise implementer of a pipeline step for this filter need if it needed to augment the enrollments data, not just add a hard-coded "enterprise_course_enrollment" key?

[pwnage101]

❌ delete this whole for-loop. You only needed this because you didn't rely on the filter to augment the enrollments values. Change the fundamental design of the filter to make in-place changes to enrollments, then remove this loop. Another litmus test for whether you've successfully de-enterprised the platform is whether the resulting file after your changes doesn't contain the word "enterprise" at all.

Suggested change

	for enrollment in enrollments:
	enrollment['enterprise_course_enrollments'] = enterprise_enrollments_by_course_id.get(
	enrollment['course_id'], []
	)