bug: store v3 - passing a cursor that doesn't correspond to any message in the store will return all messages

[fbarbu15]

Describe the bug
Issue reproduces if we pass a valid cursor, a invalid base 64 string or even a normal string. All messages are returned in all 3 cases. I would expect no message to be returned.
The issue is the same as nwaku issue: waku-org/nwaku#2716

To Reproduce

1. Have 4 messages in the store
2. Send a store v3 request with a plain string as a cursor ex:
   curl -v -X GET "http://127.0.0.1:7945/store/v3/messages?pubsubTopic=%2Fwaku%2F2%2Frs%2F0%2F0&contentTopics=%2Fmyapp%2F1%2Flatest%2Fproto&cursor=test&pageSize=100&ascending=true" -H "Content-Type: application/json"

Actual behavior

All messages in the store are returned

Expected behavior

Either empty messages list or an error saying that cursor doesn't match any message in the store

go-waku version/commit hash

harbor.status.im/wakuorg/go-waku:latest

Additional context
Logs

publishing_node.log
store_node.log