Feat/tech 9136 merge create and update flows

[Javiershenbc]

Adding frontend and backend support for merge of the create and update flows.

On the frontend this includes:

• Country selection on file upload step.
• Removal of upload mode selection.
• Rework of the fuzzy logic modal to include a previous step of reviewing the impact of this upload.
• Metadata country selection is disabled but still shown for user info

On backend:

• API endpoint for sending the file to the backend alongside of country, dataset and column_to_schema_mapping
• Query to Trino db table to get the country school ids based on iso3 code.
• School Ids normalizing and comparing.
• Result is in this form:

{
  "new_schools": 50,
  "schools_to_update": 300,
  "rows_with_school_id": 350,
  "missing_school_id_rows": 0,
  "unique_school_ids": 348,
  "duplicate_school_id_rows": 2
}

[Javiershenbc]

Update with missing ids and duplicate ids