part of https://github.com/elastic/search-team/issues/9111

#3119 didn't add the qualifier to the artifacts, but still did pass the qualifier to the release-manager command. This lead to errors like:

2025-01-17 12:04:45 CST | FAILURE: Build failed with an exception.
-- | --
  | 2025-01-17 12:04:45 CST |  
  | 2025-01-17 12:04:45 CST | * What went wrong:
  | 2025-01-17 12:04:45 CST | Some problems were found with the configuration of task ':checksumConnectorsSnapshotSHA512' (type 'DefaultTask').
  | 2025-01-17 12:04:45 CST | - Property '$1' specifies file '/artifacts/dra-artifacts/connectors-9.0.0-alpha1-SNAPSHOT.zip' which doesn't exist.
  | 2025-01-17 12:04:45 CST |  
  | 2025-01-17 12:04:45 CST | Reason: An input file was expected to be present but it doesn't exist.

This change should prevent release-manager from expecting an artifact for the snapshot flow that has the qualifier in its filename.

Checklists

Pre-Review Checklist

• this PR does NOT contain credentials of any kind, such as API keys or username/passwords (double check config.yml.example)
• this PR has a meaningful title
• this PR links to all relevant github issues that it fixes or partially addresses
• this PR has a thorough description
• Covered the changes with automated tests
• Tested the changes locally
• Added a label for each target release version (example: v7.13.2, v7.14.0, v8.0.0)
• Considered corresponding documentation changes