[FSSDK-12246] prepare release v6.3.1 #1531

Job	Run time
browser_tests (firefox)	8m 11s
lint	57s
browser_tests (edge)	10m 57s
integration_tests / test	9s
fullstack_production_suite / test	7s
browser_tests (safari)	9m 22s
typescript_test	1m 20s
browser_tests (chrome)	11m 7s
unit_tests (22)	1m 26s
unit_tests (18)	1m 39s
unit_tests (24)	1m 28s
lint_markdown_files / lint	1m 19s
unit_tests (20)	1m 29s
Coveralls coverage	3s
typescript_test	1m 23s
unit_tests (18)	1m 39s
unit_tests (24)	1m 28s
lint	57s
unit_tests (22)	1m 26s
browser_tests (safari)	9m 22s
browser_tests (edge)	10m 57s
unit_tests (20)	1m 29s
Coveralls coverage	3s
lint_markdown_files / lint	1m 19s
browser_tests (chrome)	11m 7s
browser_tests (firefox)	8m 11s
fullstack_production_suite / test	7s
integration_tests / test	9s
	1h 39m 11s

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