js-legacy: Add prepublish step #297

Job	Run time
Audit Rust	27s
Format & Lint Client JS	20s
Format & Lint CLI	2m 50s
Format & Lint Client JS Legacy	19s
Format & Lint Client Rust	0s
Format & Lint Client Rust Legacy	1m 47s
Format & Lint Confidential Transfer	31s
Format & Lint Programs	41s
Check Client Generation	20s
Check semver Rust	0s
Spellcheck Rust	50s
Test Confidential Transfer Proofs	32s
Test Client Rust	0s
Build programs	53s
Test Programs	1m 29s
Test Client JS	1m 7s
Test Client JS Legacy	4m 0s
Test Client Rust Legacy	5m 43s
Test CLI	4m 30s
	26m 19s

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