Revert "Stats collector services actors move to System pool"

[snaury]

This reverts commit 5b1ec82.

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[github-actions]

⚪ 2024-05-13 10:28:04 UTC Pre-commit check for 8ed7423 has started.
⚪ 2024-05-13 10:28:05 UTC Build linux-x86_64-relwithdebinfo is running...
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Test history

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12788	10950	0	3	1829	6

[github-actions]

⚪ 2024-05-13 10:28:53 UTC Pre-commit check for 8ed7423 has started.
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⚪ 2024-05-13 10:32:55 UTC Tests are running...
🔴 2024-05-13 12:11:45 UTC Some tests failed, follow the links below.

Test history

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
8829	8793	0	9	20	7

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⚪ 2024-05-13 10:28:54 UTC Pre-commit check for 8ed7423 has started.
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