Allow updating existing documents

[sinedied]

Currently if you upload the same document twice, it will create duplicated chunks of the same documents.
Before add a document to the database, we should remove all chunks related to the document using its filename as ID to avoid duplication and allow updates.

Tasks

• Remove all chunks with the same filename of uploaded document in POST /documents
  • for Azure ComosDB for MongoDB vCore path
  • for FAISS path when running locally

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this issue will be closed.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this issue will be closed.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this issue will be closed.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this issue will be closed.