[gitlab] fix conditional to run release candidate workflow

[celenechang]

What does this PR do?

Fix conditional noticed because the job didn't run when expected

Motivation

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Additional Notes

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Minimum Agent Versions

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• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

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Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.22%. Comparing base (26068ba) to head (4d88fa0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1462   +/-   ##
=======================================
  Coverage   49.22%   49.22%           
=======================================
  Files         224      224           
  Lines       19700    19700           
=======================================
  Hits         9697     9697           
  Misses       9497     9497           
  Partials      506      506           

Flag	Coverage Δ
unittests	49.22% <ø> (ø)

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