terraform: do not print tf file name in the errors

[muvaf]

Description of your changes

We never really go to workspace folder anymore, so it's not worth printing the file name for every error.

Fixes #82

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Manually with AWS.

[ulucinar]

Thanks @muvaf, lgtm. The file name is always main.tf.json anyway. But I guess we are losing the temp folder name in the logs, correct? But then, we can lookup the uid from the K8s resource.

For debugging purposes, I sometimes need the workspace folder's path but I guess we are trying to decrease leaks in our logs.

[muvaf]

But I guess we are losing the temp folder name in the logs, correct?

I don't think so. This only affects the non-debug errors and as checked in the unit tests, the path wasn't absolute already, i.e. only main.tf.json string is removed. We can still find the workspace path in debug logs.