refactor(systemtest): Add cli.RunAndWait for common operations (backport #21689)

[mergify]

Description

Add new helper method to systemtest cli wrapper to make system tests more stable

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Summary by CodeRabbit

• New Features

  • Introduced a streamlined method for executing CLI commands that combines execution and confirmation into a single step, enhancing efficiency.

• Bug Fixes

  • Improved reliability of staking transaction tests by ensuring commands wait for completion before proceeding, reducing potential timing issues.

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This is an automatic backport of pull request #21689 done by [Mergify](https://mergify.com).

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