Fix db for projects without a seed file or with integrations

[delucis]

Changes

• Fixes astro:db integration support when an Astro project doesn’t include a user-defined seed file.
• Source of the bug was this change: https://github.com/withastro/astro/pull/10352/files#diff-4d4325b62adab978b9a1910a7ae9742c5269220b88f3b4372ff1a2a7d7fc9704R64-R70
• This moved the table creation to be triggered when a user’s seed file is loaded. This meant in the absence of a user seed file, tables are never created.
• The fix is moving recreateTables() back to runtime, called each time we seedLocal(). @bholmesdev had some concerns about this initially but I think these were resolved in Use static imports for integration seed files in astro:db #10381.
• To help keep things organised, I’ve split seedLocal() into its own file.

Testing

• Added a fixture where an integration configures and seeds tables and no user config is present.
• Added a fixture where there is no seed file at all.
• Both tests include testing the build output.

Docs

N/A — bug fix.

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[bholmesdev]

No notes. Exseeded my expectations!