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.

Shape corrected

Code review flagged that passing an empty placeholder dict to the filter (and zipping the
results back onto enrollments via a for-loop here) left a non-enterprise pipeline-step
implementer nothing real to augment, and that the resulting for-loop should be deleted by
having the filter make in-place changes to enrollments instead
(comment,
comment). Since
openedx-filters#393 and edx-enterprise#2690 were already merged/released, the fix landed
as new PRs, which have since merged and released:

• openedx/openedx-filters — shape fix: fix: change SupportEnrollmentDataRequested to accept/return full enrollments list openedx/openedx-filters#396 (released as 3.13.0)
• openedx/edx-enterprise — shape fix: fix: change SupportEnterpriseEnrollmentDataInjector to accept/return full enrollments list openedx/edx-enterprise#2693 (released as 8.13.0)

Follow-up review also asked for the argument to keep its _data suffix
(enrollments_data, not enrollments) and for a documented example payload — both addressed
in the same two PRs above before they merged.

The call site here reads enrollments, _ = SupportEnrollmentDataRequested.run_filter(enrollments_data=enrollments, user=user) with the
zip-back for-loop deleted entirely — zero "enterprise" mentions remain in enrollments.py.

Dependency pins updated

Now that both companion PRs are released, this PR's openedx-filters/edx-enterprise pins are
bumped to match (3.13.0 / 8.13.0) in requirements/constraints.txt and the compiled
requirements files — verified locally against the real released packages that
SupportEnrollmentDataRequested.run_filter(enrollments_data=..., user=...) returns the
expected (enrollments, user) tuple.

Stale test assertion removed

With the real released packages installed, CI surfaced a genuine bug: test_get_enrollments
(which exercises the real, unmocked filter — no pipeline step configured in this repo's test
settings) asserted data[0]['enterprise_course_enrollments'] == []. That key is only ever added
by a configured pipeline step; with none configured here, run_pipeline is a no-op and the key
is never added at all — the assertion raised KeyError, not a failed equality check. Removed the
stale assertion; test_get_enrollments_with_enterprise_filter (which mocks the pipeline step)
already covers the case where the key is actually populated.

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.

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 — see
devstack-validate-ENT-11574-enrollment-filter.md.