Make size labeler actually exclude test files

Summary:
We intended to exclude test files from the PR size labeler. But the exclusions were written as regexes when the action expected glob patterns, so they didn't work 🤦‍♀️. Now they should.

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landed-with-radar-review

Differential Revision: D129035419

fbshipit-source-id: a0eb10ba6f063100915196a2dacb24b1e6a78be4

Author: rchen152

.github/workflows/automation_label_pr_size.yml

@@ -46,9 +46,10 @@ jobs:
           l_max_size: '300'
           xl_label: 'size/xl'
           fail_if_xl: 'false'
+          # The labeler matches these as bash glob patterns.
           files_to_ignore: |
-            ^test/
-            ^website/
-            ^pyrefly/lib/test/
+            test/*
+            website/*
+            pyrefly/lib/test/*
           ignore_line_deletions: 'true'
           ignore_file_deletions: 'true'