Fix failing tests due to `No space left on device`

[rwood-97]

Describe the bug
Sometimes the tests fail due to No space left on device error.

To Reproduce
See error in #574 action.

Run python -m pytest ./tests
============================= test session starts ==============================
platform linux -- Python 3.11.14, pytest-8.4.2, pluggy-1.6.0
rootdir: /home/runner/work/MapReader/MapReader
plugins: hydra-core-1.3.2, anyio-4.12.0, cov-5.0.0
collected 355 items
tests/test_annotate/test_annotator.py ............................       [  7%]
tests/test_classify/test_annotations_loader.py ....................      [ 13%]
tests/test_classify/test_classifier.py .........................F        [ 20%]
tests/test_classify/test_datasets.py EEEEEEEEEEEEEEEEEEE                 [ 26%]
tests/test_download/test_data_structures.py ...                          [ 27%]
tests/test_download/test_downloader_utils.py ...                         [ 27%]
tests/test_download/test_iiif_downloader.py .......EEEEE                 [ 31%]
tests/test_download/test_sheet_downloader.py EFEFEEEEEEEEEEEEEEEEEEEEEEE [ 38%]
EEEEEEEEEEEE                                                             [ 42%]
tests/test_geo_pipeline.py E                                             [ 42%]
tests/test_import.py .                                                   [ 42%]
tests/test_load/test_geo_utils.py F.FF                                   [ 43%]
tests/test_load/test_images.py FFFFFF.FFFFFFEEEEEEEEEFEEFEEEEEEEEEEEEEFF [ 55%]
FEEEEEFEEEEEEEEEEEEEFEEEEFEE                                             [ 63%]
tests/test_load/test_images_load_parents.py EEEEEE                       [ 65%]
tests/test_load/test_loader.py EEEEEEEE                                  [ 67%]

and:

System.IO.IOException: No space left on device : '/home/runner/actions-runner/cached/_diag/Worker_20251219-165641-utc.log'
   at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset)
   at System.IO.Strategies.OSFileStreamStrategy.Write(ReadOnlySpan`1 buffer)
   at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   at System.Diagnostics.TextWriterTraceListener.Flush()
   at GitHub.Runner.Common.HostTraceListener.WriteHeader(String source, TraceEventType eventType, Int32 id)
   at GitHub.Runner.Common.HostTraceListener.TraceEvent(TraceEventCache eventCache, String source, TraceEventType eventType, Int32 id, String message)
   at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType, Int32 id, String message)
   at GitHub.Runner.Worker.Worker.RunAsync(String pipeIn, String pipeOut)
   at GitHub.Runner.Worker.Program.MainAsync(IHostContext context, String[] args)
System.IO.IOException: No space left on device : '/home/runner/actions-runner/cached/_diag/Worker_20251219-165641-utc.log'
   at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset)
   at System.IO.Strategies.OSFileStreamStrategy.Write(ReadOnlySpan`1 buffer)
   at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   at System.Diagnostics.TextWriterTraceListener.Flush()
   at GitHub.Runner.Common.HostTraceListener.WriteHeader(String source, TraceEventType eventType, Int32 id)
   at GitHub.Runner.Common.HostTraceListener.TraceEvent(TraceEventCache eventCache, String source, TraceEventType eventType, Int32 id, String message)
   at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType, Int32 id, String message)
   at GitHub.Runner.Common.Tracing.Error(Exception exception)
   at GitHub.Runner.Worker.Program.MainAsync(IHostContext context, String[] args)
Unhandled exception. System.IO.IOException: No space left on device : '/home/runner/actions-runner/cached/_diag/Worker_20251219-165641-utc.log'
   at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset)
   at System.IO.Strategies.OSFileStreamStrategy.Write(ReadOnlySpan`1 buffer)
   at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   at System.Diagnostics.TextWriterTraceListener.Flush()
   at System.Diagnostics.TraceSource.Flush()
   at GitHub.Runner.Common.Tracing.Dispose(Boolean disposing)
   at GitHub.Runner.Common.Tracing.Dispose()
   at GitHub.Runner.Common.TraceManager.Dispose(Boolean disposing)
   at GitHub.Runner.Common.TraceManager.Dispose()
   at GitHub.Runner.Common.HostContext.Dispose(Boolean disposing)
   at GitHub.Runner.Common.HostContext.Dispose()
   at GitHub.Runner.Worker.Program.Main(String[] args)

To debug this:

1. work out what part of the test/workflow is causing this error
2. remove this from our tests or split it into multiple smaller tests