[0.3.3] Fixed Task-2817 & Issue-2844

[sujata-m]

Dev Board Ticket

• https://dev.azure.com/TDEI-UW/TDEI/_workitems/edit/2817
• https://dev.azure.com/TDEI-UW/TDEI/_workitems/edit/2844

Changes

• Updated validation to surface uploaded ZIP names (not temp extract dirs) when structure errors occur.
• Clarified unsupported GeoJSON message to list allowed patterns as *.{edges, nodes, points, lines, zones, polygons}.geojson; synced error template and tests.
• Added unit coverage for additional-properties hint and structure error filenames; refreshed unit_test_overview.md.
• Bumped package version to 0.3.3 and documented changes in CHANGELOG.md.

Testing

• Added 4 new test cases (all in tests/unit_tests/test_helpers.py and tests/unit_tests/test_osw_validation_extras.py).

• Task-2817 - would return the error in below format

[
  {
    "filename":"graph.points.geojson",
    "feature_index":1,
    "error_message":[
      "Additional properties are not allowed ('color' was unexpected). If you want to carry this tag, change it to ext:color"
    ]
  }
]

• Task-2844 - would return the error in below format

[
  {
    "filename":"valid 2.zip",
    "feature_index":"None",
    "error_message":"Unsupported .geojson files present: wa.microsoft.graph.OSW.geojson. Allowed file names are *.{edges, nodes, points, lines, zones, polygons}.geojson"
  }
]