ci: improve test execution and lint coverage #294

Job	Run time
Default Features (batteries_included + v4)	1m 50s
Test Suite (v1_local)	1m 2s
Test Suite (v2_local)	54s
Test Suite (v3_local)	1m 10s
Test Suite (v3_public)	59s
Test Suite (v4_local)	57s
Test Suite (v2_public)	1m 5s
Clippy (v1_public)	38s
Clippy (v2_local)	27s
Test Suite (v1_public)	56s
Test Suite (v4_public)	1m 0s
Clippy (v3_local)	23s
Security Audit	2m 39s
Clippy (v1_local)	34s
Clippy (v4_public)	41s
Clippy (v2_public)	16s
Clippy (v3_public)	31s
Clippy (v4_local)	47s
	16m 49s

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