Agent configuration file parsing error

#### Overview of the Issue

As shown, using the array syntax in hcl, a value is configured

But when the agent starts, it reports an error that "got string". I have to explicitly configure multiple values in the array to get around this error

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Start by recovering the exact HCL configuration from the issue screenshots and reproducing the agent startup error. Inspect the agent configuration parsing path to determine why a single-element array is treated as a string. Done means valid array syntax is accepted without the “got string” error and the behavior is covered by an appropriate test.

Written by the indexing model from the issue text.