Fix LocalFileIdentifiableStore: count and iterate only .json store files #1161

Job	Run time
sdk-static-analysis	31s
sdk-readme-codeblocks	23s
sdk-test (3.12)	30s
compliance-tool-test (3.12)	34s
server-static-analysis	33s
server-repository-docker	53s
compliance-tool-test (3.10)	32s
check-python-versions	11s
compliance-tool-static-analysis	23s
compliance-tool-package	13s
sdk-package	12s
sdk-test (3.10)	33s
sdk-docs	23s
repository-check-copyright	15s
	6m 6s

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