update generation algo to take into account coreqs

[ItsEricSun]

Pull Request

• Updated schedule generation to make sure returned schedules contain all passed in coreqs
• Updated add course modal to count coreqs together as 1 course instead of however distinct courses they are
• Updated add course modal to use the same term as the saved plan rather than just defaulting to the most recent term
• Fix auto plan naming to be an incrementing integer

Closes https://sandboxneu.slack.com/archives/C0993L6GW10/p1774828388053049

Type of Change

Please tick the boxes that best match your changes.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• This change requires a PCP (ie changes in deps, database, infrastructure, or package exports)

Testing

Please describe how you tested this PR (both manually and with tests) Provide instructions so we can reproduce.

• https://searchneu-git-fix-scheduler-coreqs-sandboxneu.vercel.app/scheduler

Checklist

• I have performed a self-review of my own code
• I have commented my code where needed
• I have made corresponding changes to the documentation
• I have run a build for the entire monorepo
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• All commits are atomic and my branch is cleaned (no WIP commits)

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Project	Deployment	Actions	Updated (UTC)
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