terraform init log timestamps include millisecond precision

[Emyrk]

Terraform init json logs to include millisecond precision. Following the trend of other logs.

Example output:

{"@level":"info","@message":"Terraform 1.13.3","@module":"terraform.ui","@timestamp":"2025-10-27T12:48:29.576675-05:00","terraform":"1.13.3","type":"version","ui":"1.2"}
{"@level":"info","@message":"Initializing the backend...","@module":"terraform.ui","@timestamp":"2025-10-27T17:48:29Z","message_code":"initializing_backend_message","type":"init_output"}

The timestamps for init_output omit milliseconds.

Target Release

1.15.x

CHANGELOG entry

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

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