feat: add currency_code variable to budget module

[lucascicco]

Hi all,

This PR solves this issue: #1023

Thanks.

[gemini-code-assist]

Summary of Changes

Hello @lucascicco, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses issue #1023 by enhancing the budget module to support explicit currency specification for budget amounts. It introduces a new currency_code variable, defaulting to USD, which is then used in the google_billing_budget resource. This change provides greater flexibility for users managing budgets in different currencies and includes relevant documentation and metadata updates.

Highlights

• New currency_code variable: Introduced a new currency_code variable in the budget module, allowing users to specify the currency for budget amounts, defaulting to USD. This variable is integrated into the google_billing_budget resource.
• Terraform Provider Version Update: The hashicorp/google provider version constraint has been updated in metadata.yaml from >= 4.28, < 7 to >= 4.28, < 8.

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[gemini-code-assist]

Code Review

This pull request introduces a currency_code variable to the budget module, which is a great addition. The changes are consistently applied across the module's documentation, variable definitions, and resource configuration.

I have one important suggestion to ensure the module's stability for all users:

• The Google provider version constraint needs to be updated. The new currency_code feature requires a newer version of the provider than what is currently specified as the minimum. I've left a specific comment on this.

Additionally, it would be beneficial to update the integration tests to validate the new currency_code functionality. This will help catch any future regressions.