Implement `tables.get_import_preview` RPC endpoint #985

Job	Run time
Check for file changes requiring python linter	10s
Check for file changes requiring python tests	11s
Check for file changes requiring all backend tests	13s
Check for file changes requiring front end checks	11s
Check for file changes requiring SQL tests	12s
Check front end code format	0s
Audit front end code	0s
Run front end tests	0s
Check front end types	0s
Run front end linter	0s
Run Python tests (3.9-bookworm, 13)	11m 42s
Run Python linter	10s
Find unused code	7s
Run Python tests (3.9-bookworm, 14)	12m 6s
Run SQL tests (13)	17s
Run Python tests (3.9-bookworm, 15)	12m 34s
Run SQL tests (14)	20s
Run Python tests (3.9-bookworm, 16)	12m 10s
Run SQL tests (15)	24s
Run Python tests (3.10-bookworm, 13)	11m 20s
Run SQL tests (16)	21s
Run Python tests (3.10-bookworm, 14)	11m 51s
Run Python tests (3.10-bookworm, 15)	11m 32s
Run Python tests (3.10-bookworm, 16)	11m 25s
Run Python tests (3.11-bookworm, 13)	11m 26s
Run Python tests (3.11-bookworm, 14)	11m 33s
Run Python tests (3.11-bookworm, 15)	11m 42s
Run Python tests (3.11-bookworm, 16)	11m 18s
Run Python tests (3.12-bookworm, 13)	11m 54s
Run Python tests (3.12-bookworm, 14)	12m 33s
Run Python tests (3.12-bookworm, 15)	12m 58s
Run Python tests (3.12-bookworm, 16)	12m 23s
matrix_tests	1s
	3h 13m 4s

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