fix(terraform): Fix possible exception when for_each data has boolean values

[alanszlosek]

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Description

Fixes #6731.

When for_each is used over data with boolean values, an exception can occur. See tests in this PR for what relevant Terraform might look like.

This fix prevents the logic from looking at an attribute's value for additional string interpolation expressions to process when it doesn't need to. Example: If we already processed monitoring="${each.value.monitoring_boolean}", we don't need to check the value of instance_type again for more interpolation expressions.

Checklist:

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

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Generated description

Dear maintainer, below is a concise technical summary of the changes proposed in this PR:

Fix an exception in ForeachAbstractHandler when processing boolean values in Terraform for_each data. Modify the logic to avoid unnecessary checks for string interpolation expressions. Update test resources to include boolean monitoring attributes, ensuring the fix is effective.

Topic	Details
Test Updates	Add tests for boolean monitoring attributes in Terraform resources to validate the fix. Modified files (3) tests/terraform/graph/variable_rendering/test_resources/dynamic_blocks_tfvars_merge/terraform.tfvars tests/terraform/graph/variable_rendering/test_resources/dynamic_blocks_tfvars_merge/main.tf tests/terraform/graph/variable_rendering/test_resources/dynamic_blocks_tfvars_merge/variables.tf Latest Contributors(1) Email Commit Date 62605534+SteveVaknin@u... fix-terraform-Fix-fore... September 08, 2024
Boolean Handling	Fix an exception in ForeachAbstractHandler when processing boolean values in Terraform for_each data. Modified files (1) checkov/terraform/graph_builder/foreach/abstract_handler.py Latest Contributors(2) Email Commit Date 62605534+SteveVaknin@u... fix-terraform-Fix-fore... September 08, 2024 [email protected]... fix-terraform-Correctl... February 04, 2024

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