feat: remove change_enterprise_user_username management command

[marlonkeating]

Note: This description is divorced from the actual code changes due to a mistake during cherry-picking.

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Cherry pick from openedx#38108

Jira Ticket

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[Copilot]

Pull request overview

This PR is described as a cherry-pick to “replace enterprise username import in progress/views.py with pluggable_override”, but the changes shown here only remove the change_enterprise_user_username Django management command and its associated tests under common/djangoapps/student/management/.

Changes:

• Removed the change_enterprise_user_username management command.
• Removed the corresponding unit tests for that command.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
common/djangoapps/student/management/commands/change_enterprise_user_username.py	Deleted the enterprise-username change management command.
common/djangoapps/student/management/tests/test_change_enterprise_user_username.py	Deleted the tests covering the removed management command.

Comments suppressed due to low confidence (1)

common/djangoapps/student/management/commands/change_enterprise_user_username.py:1

• PR title/description indicate a change to enterprise username handling in progress/views.py via pluggable_override, but this diff only deletes the change_enterprise_user_username management command (and its tests). If the deletions are intentional, please update the PR title/description to match; if not, it looks like the intended cherry-pick content is missing from this backport branch.

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[pwnage101]

Approved conditional on renaming the commit to "feat: remove change_enterprise_user_username management command".

git commit --amend -m 'feat: remove change_enterprise_user_username management command'