[8.0] [MOD-8244] fix TieredFactory::EstimateInitialSize #639

Job	Run time
spellcheck	7s
check-if-docs-only / check-only-docs-changed	3s
codeql-analysis / Analyze (cpp)	9m 26s
codeql-analysis / Analyze (python)	1m 17s
basic tests	19m 36s
coverage / Start self-hosted EC2 runner	1m 1s
coverage / codecov job	5m 52s
coverage / Stop self-hosted EC2 runner	6s
pr-validation	1s
	37m 29s

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