Label a PR before posting the blurb help comment

[DanielNoord]

Follow up to #485

python/cpython#94828 shows the previous PR works: changes to documentation are correctly labeled as skip news.
However, we're doing the check for the blurb_it help comment before we do the labeling.

This makes it so that we don't check whether we need to post that comment if we are going to label a PR as skip news.

/CC @ezio-melotti

[codecov]

Codecov Report

Merging #492 (a496aea) into main (8e5ceb2) will not change coverage.
The diff coverage is 100.00%.

@@ Coverage Diff @@## main #492 +/- ##
=========================================
Coverage 100.00% 100.00% =========================================
Files 18 18 Lines 1826 1829 +3 Branches 222 223 +1 =========================================
+ Hits 1826 1829 +3 

Flag	Coverage Δ
Python_3.10	100.00% <100.00%> (ø)
Python_3.11-dev	100.00% <100.00%> (ø)
Python_3.8	100.00% <100.00%> (ø)
Python_3.9	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
bedevere/filepaths.py	100.00% <100.00%> (ø)
bedevere/prtype.py	100.00% <100.00%> (ø)
tests/test_filepaths.py	100.00% <100.00%> (ø)