Descoping CR Feature

[wavehassman]

Changes

Removes all legacy CR UI elements and updates the CR detail page as part of the broader CR descoping epic. Specifically:

• Removed "Request Change" option from project and work package dropdown menus: "Edit" is now the only entry point
• "Implement" for auto-implementing changes (leadership), "Change Request" for changes requiring manual approval
• New project creation now directly implements without requiring a change request: "Change Request" button hidden and "Create Project" button always enabled
• Reviewer selection made optional on CR submission: removed browser-level HTML required attribute from the reviewer autocomplete
• Updated CR detail page to display the new why field directly, removing references to deleted scopeChangeRequest, proposedSolutions, and wbsProposedChanges fields
• Fixed backend car filter queries (getAllChangeRequests, getToReviewChangeRequests, getUnreviewedChangeRequests, getApprovedChangeRequests) to include CRs linked to CAR-level WBS elements, so new project proposal CRs show up correctly in all CR list views
• Updated E2E tests to reflect the new simplified CR form, removing assertions on deleted fields (ISSUE/DEFINITION_CHANGE/OTHER types, "What needs to be changed") and adding a test verifying CR submission works without a reviewer

Checklist

It can be helpful to check the Checks and Files changed tabs.
Please review the contributor guide and reach out to your Tech Lead if anything is unclear.
Please request reviewers and ping on slack only after you've gone through this whole checklist.

• All commits are tagged with the ticket number
• No linting errors / newline at end of file warnings
• All code follows repository-configured prettier formatting
• No merge conflicts
• All checks passing
• Screenshots of UI changes (see Screenshots section)
• Remove any non-applicable sections of this template
• Assign the PR to yourself
• No yarn.lock changes (unless dependencies have changed)
• Request reviewers & ping on Slack
• PR is linked to the ticket (fill in the closes line below)

Closes #4157

[chpy04]

Functionality notes:

• When I change the lead and then change another part of a project (such as the name or description or budget), it gives this error: (this does not appear to be an issue on work packages)
• Changing only the budget on a project makes a standard change request not a budget change request (I believe this was already a bug). This also feeds into functionality that I don't think we don't have right now: we should make multiple change requests if different kinds are required. For example, if I change the leadership, budget, and description, there should be a leadership CR, a standard CR, and a budget CR. On a completely seperate not I don't think we shoul dactually need CRs for changing project information other than budget, but thats another thing. If we want to say this bullet is out of scope for this branch thats fine but should definately go in the fall CR epic
• When I have the modal to submit a CR and click the dropdown to select a reviewer it is cut off by the modal and I have to scroll
• After I submit a CR it takes me back to the CR page. it should take me to the change requests page
• implement and create change request buttons are not merged into one but they should be
• Allow any head or admin plus requested reviewer to review on slack