fix: Gitops validate and update with empty token

[Ashish-devtron]

Description

We should update the token from database if token is empty during update request and during validation.

Fixes #https://dev.azure.com/DevtronLabs/Devtron/_workitems/edit/2518

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

[x] Tested the code by deploying on cluster

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR requires documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have tested it for all user roles.
• I have added all the required unit/api test cases.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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