Merging to release-5.0.15: update code of usage of gorpc waitgroup (#6661) (#6662)

update code of usage of gorpc waitgroup (#6661)

<details open>
<summary><a href="https://tyktech.atlassian.net/browse/TT-13130"
title="TT-13130" target="_blank">TT-13130</a></summary>
  <br />
  <table>
    <tr>
      <th>Summary</th>
<td>Tyk Cloud: Panic appears when a user tried to deploy GW before
Control Plane is in deployed state </td>
    </tr>
    <tr>
      <th>Type</th>
      <td>
<img alt="Bug"

src="https://tyktech.atlassian.net/rest/api/2/universal_avatar/view/type/issuetype/avatar/10303?size=medium"
/>
        Bug
      </td>
    </tr>
    <tr>
      <th>Status</th>
      <td>In Dev</td>
    </tr>
    <tr>
      <th>Points</th>
      <td>N/A</td>
    </tr>
    <tr>
      <th>Labels</th>
<td><a

href="https://tyktech.atlassian.net/issues?jql=project%20%3D%20TT%20AND%20labels%20%3D%20Re_open%20ORDER%20BY%20created%20DESC"
title="Re_open">Re_open</a>, <a

href="https://tyktech.atlassian.net/issues?jql=project%20%3D%20TT%20AND%20labels%20%3D%20QA_Fail%20ORDER%20BY%20created%20DESC"
title="QA_Fail">QA_Fail</a></td>
    </tr>
  </table>
</details>
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---

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## Description

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## Related Issue

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## Motivation and Context

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## How This Has Been Tested

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## Screenshots (if appropriate)

## Types of changes

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the boxes that apply: -->

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Refactoring or add test (improvements in base code or adds test
coverage to functionality)

## Checklist

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that apply -->
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checked. -->
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- [ ] I ensured that the documentation is up to date
- [ ] I explained why this PR updates go.mod in detail with reasoning
why it's required
- [ ] I would like a code coverage CI quality gate exception and have
explained why

---------

Co-authored-by: sredny buitrago <[email protected]>

Co-authored-by: Sredny M. <[email protected]>

Author: buger

rpc/rpc_client.go

@@ -258,10 +258,6 @@ func Connect(connConfig Config, suppressRegister bool, dispatcherFuncs map[strin
 		clientSingleton.Conns = 5
 	}
 
-	for i := 0; i < clientSingleton.Conns; i++ {
-		connectionDialingWG.Add(1)
-	}
-
 	clientSingleton.Dial = func(addr string) (conn net.Conn, err error) {
 		dialer := &net.Dialer{
 			Timeout:   10 * time.Second,
@@ -298,8 +294,6 @@ func Connect(connConfig Config, suppressRegister bool, dispatcherFuncs map[strin
 		conn.Write([]byte("proto2"))
 		conn.Write([]byte{byte(len(connID))})
 		conn.Write([]byte(connID))
-		// only mark as done is connection is established
-		connectionDialingWG.Done()
 
 		return conn, nil
 	}