### Introduction
Repository streamlit-fansifter-fileupload-app(stored locally) contains Streamlit in Snowflake app.
That app allows users to select label/artist values from drop down filters and then upload CSV file

### Objective
We need to create new page for current project's Streamlit app called app_fileupload.py that needs refactoring
from the perspective of data used in the filters.

### Detailed information about changes
1. Territory, label, artist, mailing list drop down filters should be replaced with values from this query:
    with fansifter_artist as (
    select vendor_id, global_participant_id from fansifter_app_reporting.prod.artist_roster_main_rep
    -- status=INACTIVE
    union
    select vendor_id, global_participant_id from fansifter_app_reporting.prod.artist_roster_local_rep
    )
    select fa.vendor_id, v.name as label_name, fa.global_participant_id, gp.name as artist_name,
    ml.id as mailing_list_id, ml.name as mailing_list_name
    from fansifter_artist fa
    inner join facts.prod.vendor v on fa.vendor_id = v.vendor_id
    inner join facts.prod.global_participant gp on gp.id = fa.global_participant_id
    inner join PREFERENCE_CENTER.PROD.FAN_MAILING_LIST ML ON gp.id=ml.global_participant_id
    where not v.is_deleted;

2. General layout changes- streamlit-fansifter-fileupload-app has different pages(delete, file upload, status).
For this implementation we want to use tabs.

3. For rest of the changes follow current repository(streamlit-fansifter-backoffice-app) code writing patterns/approaches