refactor: remove unreachable Partition delta-computation interface methods #5845

Job	Run time
Native host build (macos-latest)	4m 10s
TypeScript type check	8m 18s
Native host build (ubuntu-latest)	3m 48s
Security audit	8s
Rust compile check	1m 8s
Lint	6m 45s
Grammar version parity	7s
Native host build (windows-2022)	6m 19s
Verify dynamic imports	9s
Pre-publish benchmark gate	11m 43s
Test Node 22 (ubuntu-latest)	9m 13s
Test Node 22 (macos-latest)	14m 43s
Engine parity (windows-2022)	11m 4s
Test Node 22 (windows-2022)	17m 10s
Engine parity (macos-latest)	7m 42s
Engine parity (ubuntu-latest)	7m 24s
CI Testing Pipeline	4s
	1h 49m 55s

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