Add additional checks in batch uploader

[LocalNewsTV]

Overview

This PR includes the following proposed change(s):

• linked_id is optional, if a shortId is not provided, skip the validation
• If shortID is not properly formatted, exit early citing issue.
• Sever database connections at end of functions

How it was tested

1. Got CSV used to cause the original crash
2. Added proper error handling so it passed without crash/hang
3. Added Invalid ShortIDs so first rounds of checks would pass, then address hangups from subsequent ones

Will better handle when now when ShortID:

• Missing
• Malformed
• Yields no results

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)
16.0% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud