Do not reload config file on PS reconnect (#10204)

## Problem

See #10184
and
https://neondb.slack.com/archives/C04DGM6SMTM/p1733997259898819

Reloading config file inside parallel worker cause it's termination

## Summary of changes

Remove call of `HandleMainLoopInterrupts()` 
Update of page server URL is propagated by postmaster through shared
memory and we should not reload config for it.

Co-authored-by: Konstantin Knizhnik <[email protected]>

pgxn/neon/libpagestore.c

@@ -827,7 +827,6 @@ pageserver_send(shardno_t shard_no, NeonRequest *request)
 	{
 		while (!pageserver_connect(shard_no, shard->n_reconnect_attempts < max_reconnect_attempts ? LOG : ERROR))
 		{
-			HandleMainLoopInterrupts();
 			shard->n_reconnect_attempts += 1;
 		}
 		shard->n_reconnect_attempts = 0;