maint: migrate various data sources to tflog structured logging

[slymanmrcan]

Addresses parts of #3070

Before the change?

"Logging was using the standard Go log package, which outputs unstructured text to stdout."

After the change?

"Migrated selected data sources to use tflog for structured logging. This allows for better log filtering and follows the Terraform Plugin SDK v2 best practices."

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[deiga]

Please remove the resolves comment, since it adresses the issue only partly. And "resolves" will close the issue

[slymanmrcan]

I just removed it from the description

[deiga]

Would you be available to rebase this (possibly multiple times) during the next week? We're going to release 6.13.0 and will try to land some of these open PRs

[slymanmrcan]

I've updated the branch and I'm available to rebase again if needed.

[stevehipwell]

Thanks for the PR @slymanmrcan. Could you please make sure that the tflog calls in this PR are all single line.

[stevehipwell]

LGTM

[robert-crandall]

Thanks for chipping away at #3070! This is a clean, well-scoped move to structured logging - builds, vets, and formats cleanly on my end, and it lines up nicely with how tflog is already used elsewhere in the provider.

[deiga]

@slymanmrcan Please rebase so that we can merge this :)