Remove MoJRedTeam and granttvm-purple-team access to cooker

[richgreen-moj]

A reference to the issue / Description of it

As requested in the ask channel here: https://mojdt.slack.com/archives/C01A7QK5VM1/p1736171196013009

And after the requirement was refined in a private group chat here: https://moj.enterprise.slack.com/archives/C087EKMGXLK

How does this PR fix the problem?

1. Removes MoJRedTeam acceess from cooker as they no longer require it.

2. Grantstvm-purple-team access to cooker as agreed

How has this been tested?

Please describe the tests that you ran and provide instructions to reproduce.

{Please write here}

Deployment Plan / Instructions

Will this deployment impact the platform and / or services on it?

{Please write here}

Checklist (check x in [ ] of list items)

• I have performed a self-review of my own code
• All checks have passed
• I have made corresponding changes to the documentation
• Plan and discussed how it should be deployed to PROD (If needed)

Additional comments (if any)

{Please write here}

[github-actions]

Please check the plan carefully before deploying these changes.

⚠️ Making changes to the environments/*.json files will affect MP AWS accounts, for more information on the potential impact of these changes consult the documentation.

[github-actions]

Trivy Scan Success

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Trivy will check the following folders:

</details> #### `Checkov Scan` Success
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CTFLint Scan Success

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Setting default tflint config...
Running tflint --init...
Installing "terraform" plugin...
Installed "terraform" (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.9.1)
tflint will check the following folders:

Trivy Scan Success

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Trivy will check the following folders:

[github-actions]

Terraform Plan Summary

github
Plan: 27 to add, 0 to change, 0 to destroy.