feat: testConnection for filestores #19268
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Implemented testConnection for filestores.
All file stores (S3, GCS, HTTP, local) test connectivity by checking if a well-known healthcheck file (
.healthcheck) exists. This approach was chosen because:When uploading is enabled, the sequencer uploads the healthcheck file on startup and then periodically re-uploads it (by default every 60 minutes) to ensure it remains available. This guards against accidental deletion, storage pruning, or other failures that might remove the file.