Merge bitcoin/bitcoin#29882: netbase: clean up Proxy logging

fb4cc5f netbase: clean up Proxy logging (Matthew Zipkin)

Pull request description:

  Follow up to #27375 and see bitcoin/bitcoin#29649 (comment)

  This removes an extra log message when we can't connect to our own proxy, and another when the proxy is invalid.

  ## Before #27375 if proxy is unreachable

  ```
  2024-04-15T17:54:51Z connect() to 127.0.0.1:9999 failed after wait: Connection refused (61)
  2024-04-15T17:54:52Z connect() to 127.0.0.1:9999 failed after wait: Connection refused (61)
  2024-04-15T17:54:52Z connect() to 127.0.0.1:9999 failed after wait: Connection refused (61)
  2024-04-15T17:54:53Z connect() to 127.0.0.1:9999 failed after wait: Connection refused (61)
  2024-04-15T17:54:53Z connect() to 127.0.0.1:9999 failed after wait: Connection refused (61)
  ```

  ## After #27375 if unix proxy is unreachable:

  ```
  2024-04-15T17:54:03Z connect() to /Users/matthewzipkin/Desktop/tor failed: No such file or directory (2)
  2024-04-15T17:54:03Z Cannot connect to socket for /Users/matthewzipkin/Desktop/tor
  2024-04-15T17:54:04Z connect() to /Users/matthewzipkin/Desktop/tor failed: No such file or directory (2)
  2024-04-15T17:54:04Z Cannot connect to socket for /Users/matthewzipkin/Desktop/tor
  2024-04-15T17:54:04Z connect() to /Users/matthewzipkin/Desktop/tor failed: No such file or directory (2)
  2024-04-15T17:54:04Z Cannot connect to socket for /Users/matthewzipkin/Desktop/tor
  2024-04-15T17:54:05Z connect() to /Users/matthewzipkin/Desktop/tor failed: No such file or directory (2)
  2024-04-15T17:54:05Z Cannot connect to socket for /Users/matthewzipkin/Desktop/tor
  ```

  ## After this PR:

  ```
  2024-04-15T18:18:51Z connect() to /Users/matthewzipkin/Desktop/tor failed: No such file or directory (2)
  2024-04-15T18:18:51Z connect() to /Users/matthewzipkin/Desktop/tor failed: No such file or directory (2)
  2024-04-15T18:18:52Z connect() to /Users/matthewzipkin/Desktop/tor failed: No such file or directory (2)
  2024-04-15T18:18:52Z connect() to /Users/matthewzipkin/Desktop/tor failed: No such file or directory (2)
  ```

ACKs for top commit:
  tdb3:
    CR ACK for fb4cc5f
  laanwj:
    ACK fb4cc5f

Tree-SHA512: f07b9f7f2ea9f4bc01780c09f0b076547108294a1fa7d158a0dd48d6d7351569e461e5cccf232b7b1413ce2e3679668e523e5a7c89cd58c909da76d3dcbc34de

Author: fanquake

src/netbase.cpp

@@ -632,10 +632,7 @@ std::unique_ptr<Sock> ConnectDirectly(const CService& dest, bool manual_connecti
 
 std::unique_ptr<Sock> Proxy::Connect() const
 {
-    if (!IsValid()) {
-        LogPrintf("Cannot connect to invalid Proxy\n");
-        return {};
-    }
+    if (!IsValid()) return {};
 
     if (!m_is_unix_socket) return ConnectDirectly(proxy, /*manual_connection=*/true);
 
@@ -656,7 +653,6 @@ std::unique_ptr<Sock> Proxy::Connect() const
     socklen_t len = sizeof(addrun);
 
     if(!ConnectToSocket(*sock, (struct sockaddr*)&addrun, len, path, /*manual_connection=*/true)) {
-        LogPrintf("Cannot connect to socket for %s\n", path);
         return {};
     }