Fix ondemand E2E slack message

[albertogdd]

Description

Default mode (main branch) prints an empty branch value. This fixes it.

How can this be tested?

There is no need; it's exactly the same in the working workflow e2e-tests.yaml.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.25%. Comparing base (06029bb) to head (d544ef3).
Report is 2 commits behind head on main.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3458      +/-   ##
==========================================
+ Coverage   57.23%   57.25%   +0.01%     
==========================================
  Files         344      344              
  Lines       19783    19791       +8     
==========================================
+ Hits        11323    11331       +8     
  Misses       7222     7222              
  Partials     1238     1238              

Flag	Coverage Δ
unittests	57.25% <ø> (+0.01%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.