Created dormant automation runs table

[EvanHahn]

closes https://linear.app/ghost/issue/NY-1189

This creates a table and model for Welcome Email Automation Runs. Currently unused.

This change was written by Claude Sonnet 4.6 on Low effort mode against the following prompt:

I'm starting to build a "welcome email automations" feature. See the attached design document below for background.

I've already built the `welcome_email_automations` and `welcome_email_automated_emails` tables/models. But now I need to build the `welcome_email_automation_runs` table/model. It should have the following fields:

* `welcomeEmailAutomationId: string` (foreign key reference to `welcome_email_automations`)
* `memberId: string` (foreign key reference to members)
* `nextWelcomeEmailAutomatedEmailId: null | string` (foreign key reference to `welcome_email_automated_emails`. `null` if finished)
* `readyAt: null | Date`
* `stepStartedAt: null | Date`
* `stepAttempts: uint`
* `exitReason: null | 'member not found' | 'email send failed' | 'member unsubscribed' | 'member changed status' | 'finished'`

This table and model should be dormant. That is, there should be no way to interact with it right now. We'll add all that in the future.

There should be no special database indexes (other than what's automatically created on the `id` primary key and the foreign keys).

Use red/green TDD to accomplish this task.

<design_document>
{design document copy-pasted here}
</design_document>

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[github-actions]

It looks like this PR contains a migration 👀
Here's the checklist for reviewing migrations:

General requirements

• ⚠️ Tested performance on staging database servers, as performance on local machines is not comparable to a production environment
• Satisfies idempotency requirement (both up() and down())
• Does not reference models
• Filename is in the correct format (and correctly ordered)
• Targets the next minor version
• All code paths have appropriate log messages
• Uses the correct utils
• Contains a minimal changeset
• Does not mix DDL/DML operations
• Tested in MySQL and SQLite

Schema changes

• Both schema change and related migration have been implemented
• For index changes: has been performance tested for large tables
• For new tables/columns: fields use the appropriate predefined field lengths
• For new tables/columns: field names follow the appropriate conventions
• Does not drop a non-alpha table outside of a major version

Data changes

• Mass updates/inserts are batched appropriately
• Does not loop over large tables/datasets
• Defends against missing or invalid data
• For settings updates: follows the appropriate guidelines

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud