ci: increase test-system timeout (backport #22386)

[mergify]

Description

Closes: #XXXX

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Summary by CodeRabbit

• Chores
  • Updated the system tests configuration to include a timeout of 15 minutes for test execution, enhancing test reliability.

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This is an automatic backport of pull request #22386 done by [Mergify](https://mergify.com).

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