[BUG]: Re-upload error logging

[matteokosina]

BEFORE STATE:

On re-upload a user is presented with a 500 Internal Server Error, the API-Server logs show

7:57AM DBG Sent artifact chunk host=<host> sent_bytes=231 service=api-server version=v0.6.0
7:57AM INF HTTP Request host=<host> ip=<ip> latency=278.280657 method=POST path=/artifact/upload service=api-server size=224 status=201 user_agent=bruno-runtime/2.14.2 version=v0.6.0
7:58AM DBG Authenticating user with BasicAuth host=<host> service=api-server user=<username> version=v0.6.0
7:58AM DBG Sent artifact chunk host=<host> sent_bytes=231 service=api-server version=v0.6.0
7:58AM ERR Failed to finalize artifact upload error="rpc error: code = AlreadyExists desc = Artifact already exists for storing artifact metadata" host=<host> service=api-server version=v0.6.0
7:58AM WRN HTTP Request host=<host> ip=<ip> latency=93.675282 method=POST path=/artifact/upload service=api-server size=-1 status=500 user_agent=bruno-runtime/2.14.2 version=v0.6.0

STATE NOW:

On re-upload a user is presented with a 409 Already exists error and an error description: An artifact already exists with this fully qualified name and version hash

[EnclaveAutomation]

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Details:

• Commit: (7e01938)

[Copilot]

Pull request overview

This PR fixes a bug where re-uploading an existing artifact incorrectly returns a 500 Internal Server Error. The fix properly handles the gRPC AlreadyExists error by returning a 409 Conflict status with a descriptive error message instead.

Changes:

• Added error handling to detect gRPC AlreadyExists errors during artifact upload
• Returns HTTP 409 status code with descriptive message for duplicate artifact uploads
• Maintains existing 500 error handling for other upload failures

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