native: add test for custom Koblitz witness verification script #1088

Job	Run time
Check code generated with 'go generate' is up-to-date	41s
CodeQL (go)	2m 46s
Check internal dependencies	7s
Lint	1m 1s
Coverage	6m 22s
Run tests (ubuntu-22.04, 1.20)	7m 49s
Run tests (ubuntu-22.04, 1.21)	6m 53s
Run tests (windows-2022, 1.22)	21m 59s
Run tests (macos-12, 1.22)	10m 47s
Run tests (macos-14, 1.22)	16m 1s
	1h 14m 26s

Provide feedback