fix: enforce maxConcurrentFileReads limit in read_file tool #20739

Job	Run time
knip	50s
check-translations	43s
check-openrouter-api-key	4s
compile	2m 29s
platform-unit-test (windows-latest)	9m 32s
platform-unit-test (ubuntu-latest)	5m 34s
integration-test	3m 9s
	22m 21s

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