tests: benchmarks: multicore: idle_uarte: reworks

[nordic-pikr]

Add test case for changing GD frequency when driver is active and necessary reworks.

[github-actions]

After documentation is built, you will find the preview for this PR here.

[NordicBuilder]

CI Information

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Build number: 2

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Enabled	Name	Description
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	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

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Test Spec & Results: ✅ Success; ❌ Failure; 🟠 Queued; 🟡 Progress; ◻️ Skipped; ⚠️ Quarantine

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[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

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