Fix variable shadowing in utilities.rego to resolve Regal linting error

[sukeshreddyg]

A reference to the issue / Description of it

The issue was related to a regal lint error in the utilities.rego file where the variable object was used, which conflicts with a built-in function in Rego. This shadowing of a built-in function caused linting issues, potentially leading to unexpected behavior in policy evaluation. The issue required renaming the variable to avoid conflict with the built-in object function in Rego. #7670

https://github.com/ministryofjustice/modernisation-platform/actions/runs/10474087493/job/29007520608#step:5:37

How does this PR fix the problem?

This PR fixes the issue where the variable name object was shadowing a built-in function in Rego. The object variable has been renamed to obj to avoid conflicts with the built-in object function, thereby resolving the var-shadows-builtin linting error reported by regal lint.

How has this been tested?

This change was tested by running the regal lint --format=github policies command locally after the update. No errors were reported, confirming that the variable shadowing issue has been resolved.

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

NO

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)

[github-actions]

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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: 0.5.0)
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