Fix `S3Bucket.copy_object` target path resolution

[dominictarro]

Closes #384

Uses other bucket's _resolve_path method when copying to another S3Bucket object. If to_bucket is a string, doesn't resolve. Copies to self when to_bucket is None.

Example

from prefect_aws import S3Bucket

source = S3Bucket(bucket_name="source-bucket")
target = S3Bucket(bucket_name="target-bucket", bucket_folder="subpath/")
source.copy_object("abc.txt", "copies/abc.txt", target)
# subpath/copies/abc.txt

Screenshots

Checklist

• [x] References any related issue by including "Closes #" or "Closes ".
  • If no issue exists and your change is not a small fix, please create an issue first.
• [x] Includes tests or only affects documentation.
• [x] Passes pre-commit checks.
  • Run pre-commit install && pre-commit run --all locally for formatting and linting.
• [ ] Includes screenshots of documentation updates.
  • Run mkdocs serve view documentation locally.

[dominictarro]

Unclear what's up with the error message. Did something break in main?

AttributeError: 'CallSpec2' object has no attribute 'funcargs'

[zzstoatzz]

hey @dominictarro - that's because we had an issue with pytest. that change is merged now and we should be back to normal here. thanks for catching!

[dominictarro]

I just noticed that the same issue is in the move methods, so don't merge yet. Going to revisit this when I have time.

[dominictarro]

This is ready for review.