fix(terraform_plan): Run provider checks against all providers in plan

[alanszlosek]

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Description

I noticed that plan scanning only runs provider checks against first provider listed in the plan. After looking at the code I could see that subsequent provider blocks were being merged into the same provider_map.

Fixes #7060

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes

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Generated description

Below is a concise technical summary of the changes proposed in this PR:

Topic	Details
Plan Parser Update	Modifies the Terraform plan parser to handle multiple provider configurations Modified files (1) checkov/terraform/plan_parser.py Latest Contributors(2) User Commit Date bo156 feat-terraform_plan-Su... October 20, 2024 maxamel feat-terraform_plan-ad... September 04, 2024
Test Coverage	Adds test resources and cases for multiple provider configurations Modified files (3) tests/terraform/parser/test_plan_parser.py tests/terraform/parser/resources/plan_multiple_providers/multiple_providers.tf tests/terraform/parser/resources/plan_multiple_providers/tfplan.json Latest Contributors(2) User Commit Date bo156 feat-terraform_plan-Su... October 20, 2024 maxamel feat-terraform_plan-ad... September 04, 2024

This pull request is reviewed by Baz. Join @alanszlosek and the rest of your team on (Baz).

[tsmithv11]

Nicely done. Thanks! 🚀