fix(op-alt-da): ensure HTTP response bodies are closed in error cases

[maximevtush]

Summary

Fixes a resource leak in op-alt-da/daclient.go by ensuring HTTP response bodies are properly closed in all error scenarios.

Problem

The GetInput method in DAClient was not closing HTTP response bodies when returning early due to error status codes (404, non-200). This can lead to:

• Resource leaks and file descriptor exhaustion
• Performance degradation due to inability to reuse connections
• Potential connection pool exhaustion under load

Solution

Moved defer resp.Body.Close() immediately after the client.Do(req) call to guarantee response body closure in all execution paths, including error cases.