test(mbtiles): Generate mbtiles dynamically from SQL files to increase debuggability and transparency

[sdf-jkl]

Which issue does this PR close?

• Closes Generate test mbtiles on the fly rather than storing them #1846.

What changes are included in this PR?

• Remove the jpg, png and other blobs from .sql files used to generate mbtiles for unit and integration tests.
• Remove most tiles, leaving only the ones needed for testing.

Are these changes tested?

• Tested the unit tests
• Testing the integration tests using github actions

[sdf-jkl]

@CommanderStorm @nyurik Hi, finally getting to work on this.

I think I made most of the changes to the .mbtiles files, but there are some unit tests that I can't test on my local machine (really stupid, I should get a personal linux machine).

Same goes for integration tests.

Would you please help me fix the remaining unit and integration tests to close this PR and the issue?

[sdf-jkl]

Got stuck in Code Coverage here:

[2025-11-26T16:19:35Z INFO  martin::config::file::file_config] Configured source webp2 from URL http://localhost:5412/webp2.pmtiles
  [2025-11-26T16:19:35Z INFO  martin::config::file::file_config] Configured source geography-class-png-no-bounds from /home/runner/work/martin/martin/tests/fixtures/mbtiles/geography-class-png-no-bounds.mbtiles
  [2025-11-26T16:19:35Z INFO  martin::config::file::file_config] Configured source geography-class-jpg from /home/runner/work/martin/martin/tests/fixtures/mbtiles/geography-class-jpg.mbtiles
  [2025-11-26T16:19:35Z INFO  martin::config::file::file_config] Configured source zoomed_world_cities from /home/runner/work/martin/martin/tests/fixtures/mbtiles/zoomed_world_cities.mbtiles
  [2025-11-26T16:19:35Z INFO  martin::config::file::file_config] Configured source webp from /home/runner/work/martin/martin/tests/fixtures/mbtiles/webp.mbtiles
  [2025-11-26T16:19:35Z INFO  martin::config::file::file_config] Configured source geography-class-jpg-diff from /home/runner/work/martin/martin/tests/fixtures/mbtiles/geography-class-jpg-diff.mbtiles
  [2025-11-26T16:19:35Z ERROR martin] Unable to parse metadata in file tests/fixtures/mbtiles/geography-class-jpg-diff.mbtiles: No tiles found
  Martin died!

Can't figure out what is wrong with geography-class-jpg-diff.mbtiles tiles.
@nyurik Can you please help, when you're available.