feat: add internal flag to job-run table

[hmacr]

Closes #557

✅ Checklist

• I have followed every step in the contributing guide
• The PR title follows the convention.
• I ran and tested the code works

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Testing

• Verified the migration is applied and the column is added to JobRun table.
• Verified the new job runs are using the internal flag from Job table (I did this by manually updating the internal flag for one of the jobs).

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Changelog

• Add new column internal in JobRun table (defaults to false)
• Set JobRun internal flag based on the job's definition in the createRun API.

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[ericallam]

@hmacr Actually I think you should move that backfill SQL query into the packages/database/prisma/migrations/20231005064823_add_job_run_internal/migration.sql migration file in this PR, and go ahead and close #564

[hmacr]

@ericallam I've moved the query as suggested.