Return the empty caches message as error log, not standard log

[ForsakenHarmony]

Describe the bug

Right now, the plugin prints out There are no Actions caches currently present in this repo or for the provided filters when there are no caches.
If you pipe this into another command, there's no differentiation between this and a normal cache entry output. The message should either not be printed or be printed to the error log when in a non-interactive context.

Steps to reproduce the behavior

1. Execute gh actions-cache list -B refs/heads/doesnotexist

Logs

Using the recommended action to delete caches from actions/cache#981 leads to this log

Error: Cache with input key 'There' does not exist
Error: Cache with input key 'are' does not exist
Error: Cache with input key 'no' does not exist
Error: Cache with input key 'Actions' does not exist
Error: Cache with input key 'caches' does not exist
Error: Cache with input key 'currently' does not exist
Error: Cache with input key 'present' does not exist
Error: Cache with input key 'in' does not exist
Error: Cache with input key 'this' does not exist
Error: Cache with input key 'repo' does not exist
Error: Cache with input key 'or' does not exist
Error: Cache with input key 'for' does not exist
Error: Cache with input key 'the' does not exist
Error: Cache with input key 'provided' does not exist
Error: Cache with input key 'filters' does not exist