[gitlab] fix condition to run release candidate workflow (#1462)

[celenechang]

What does this PR do?

Cherry-pick https://github.com/DataDog/datadog-operator/pull/1462

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 :white_check_mark:

Project coverage is 48.90%. Comparing base (d33a34f) to head (b76c14d).

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.10    #1483   +/-   ##
=======================================
  Coverage   48.90%   48.90%           
=======================================
  Files         225      225           
  Lines       19828    19828           
=======================================
  Hits         9696     9696           
  Misses       9628     9628           
  Partials      504      504           

Flag	Coverage Δ
unittests	48.90% <ø> (ø)

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