tests/dump_db: Add schema.sql to the test

[Turbo87]

Instead of only running import.sql on a database with all migrations applied we can run the generated schema.sql file on an empty database. This ensures that the schema and data import scripts are compatible with each other.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.50%. Comparing base (e972a9b) to head (9614c37).

❗ Current head 9614c37 differs from pull request most recent head fefd9a0

Please upload reports for the commit fefd9a0 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8742   +/-   ##
=======================================
  Coverage   88.49%   88.50%           
=======================================
  Files         276      276           
  Lines       27468    27496   +28     
=======================================
+ Hits        24309    24336   +27     
- Misses       3159     3160    +1     

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