Merging to release-5.7: [TT-13535/TT-13566] make upstream oauth passw…

…ord client secret not required (#6701) (#6706)

### **User description**
<details open>
<summary><a href="https://tyktech.atlassian.net/browse/TT-13566"
title="TT-13566" target="_blank">TT-13566</a></summary>
  <br />
  <table>
    <tr>
      <th>Summary</th>
<td>Make upstream auth oauth password client secret not required in oas
schema</td>
    </tr>
    <tr>
      <th>Type</th>
      <td>
<img alt="Sub-task"
src="https://tyktech.atlassian.net/rest/api/2/universal_avatar/view/type/issuetype/avatar/10316?size=medium"
/>
        Sub-task
      </td>
    </tr>
    <tr>
      <th>Status</th>
      <td>Ready for Testing</td>
    </tr>
    <tr>
      <th>Points</th>
      <td>N/A</td>
    </tr>
    <tr>
      <th>Labels</th>
      <td>-</td>
    </tr>
  </table>
</details>
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---

[TT-13535/TT-13566] make upstream oauth password client secret not
required (#6701)

<!-- Provide a general summary of your changes in the Title above -->

## Description

make upstream oauth password client secret not required

## Related Issue
Parent: https://tyktech.atlassian.net/browse/TT-13535
Subtask: https://tyktech.atlassian.net/browse/TT-13566
## Motivation and Context

<!-- Why is this change required? What problem does it solve? -->

## How This Has Been Tested

<!-- Please describe in detail how you tested your changes -->
<!-- Include details of your testing environment, and the tests -->
<!-- you ran to see how your change affects other areas of the code,
etc. -->
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## Screenshots (if appropriate)

## Types of changes

<!-- What types of changes does your code introduce? Put an `x` in all
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

<!-- Go over all the following points, and put an `x` in all the boxes
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


___

### **PR Type**
Enhancement


___

### **Description**
- Removed the requirement for `clientSecret` in the OAuth password flow
schema, making it optional.
- This change allows for more flexible configurations where a client
secret is not necessary.



___



### **Changes walkthrough** 📝
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>x-tyk-api-gateway.json</strong><dd><code>Make
`clientSecret` optional in OAuth password schema</code>&nbsp; &nbsp;
&nbsp; &nbsp; </dd></summary>
<hr>

apidef/oas/schema/x-tyk-api-gateway.json

<li>Removed <code>clientSecret</code> from the list of required
fields.<br> <li> Updated the schema to make <code>clientSecret</code>
optional for OAuth password <br>flows.<br>


</details>


  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6706/files#diff-78828969c0c04cc1a776dfc93a8bad3c499a8c83e6169f83e96d090bed3e7dd0">+0/-1</a>&nbsp;
&nbsp; &nbsp; </td>

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

___

> 💡 **PR-Agent usage**: Comment `/help "your question"` on any pull
request to receive relevant information

Co-authored-by: Jeffy Mathew <[email protected]>

apidef/oas/schema/x-tyk-api-gateway.json

@@ -2128,7 +2128,6 @@
           },
           "required": [
             "clientId",
-            "clientSecret",
             "tokenUrl",
             "username",
             "password"