[TT-13107] [release-5.3] remove verbose error log (#6530)

### **User description**
https://tyktech.atlassian.net/browse/TT-13107


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### **PR Type**
Bug fix


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### **Description**
- Removed verbose error logging in `RedisQuotaExceeded` function when
quota is disabled, simplifying the code and reducing unnecessary log
output.
- This change addresses the issue where logs were cluttered with error
messages when the quota maximum was set to zero.


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### **Changes walkthrough** 📝
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Bug
fix</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>session_manager.go</strong><dd><code>Remove verbose
error logging for disabled quota</code>&nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </dd></summary>
<hr>

gateway/session_manager.go

<li>Removed verbose error logging when quota is disabled.<br> <li>
Simplified the code by eliminating unnecessary logging.<br>


</details>


  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6530/files#diff-e6b40a285464cd86736e970c4c0b320b44c75b18b363d38c200e9a9d36cdabb6">+0/-1</a>&nbsp;
&nbsp; &nbsp; </td>

</tr>                    
</table></td></tr></tr></tbody></table>

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Co-authored-by: Tit Petric <tit@tyk.io>

gateway/session_manager.go

@@ -338,7 +338,6 @@ func (l *SessionLimiter) RedisQuotaExceeded(r *http.Request, session *user.Sessi
 	})
 
 	if limit.QuotaMax <= 0 {
-		logger.Error("Quota disabled: quota max <= 0")
 		return false
 	}