Ignore Poetry installation error log files.

[anybodys]

Ticket

n/a

Changes

• Add a line to the gitignore file for app to ignore local Poetry error log files.

Context for reviewers

These are only relevant to the individual's local dev env and do not belong in the repo.

Testing

Tested by running git status and seeing that my many local Poetry installation error log files are now ignored. 😀

Before:

After:

[lorenyu]

cc @chouinar