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[FSSDK-11789] Maintenance: remove unused testapp folder from tests #453

Job	Run time
linting	12s
integration_tests / test	4s
fullstack_production_suite / test	4s
lint_markdown_files	44s
test (pypy-3.10)	1m 32s
test (3.10)	35s
test (pypy-3.9)	1m 28s
test (3.8)	39s
type-check (pypy-3.8)	1m 52s
type-check (pypy-3.9)	1m 41s
test (3.11)	39s
type-check (pypy-3.10)	1m 22s
test (3.9)	39s
test (pypy-3.8)	2m 30s
type-check (3.10)	20s
type-check (3.9)	18s
type-check (3.8)	21s
type-check (3.12)	21s
test (3.12)	38s
type-check (3.11)	18s
	16m 17s

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