perf(sw/emulated): use `fakeGLV` and remove `scalarMulGeneric` (#1654) #608

Job	Run time
staticcheck	2m 16s
test (1.23.x, windows-latest)	5m 50s
test (1.23.x, macos-latest)	3m 43s
test (1.23.x, gha-runner-scale-set-ubuntu-24-amd64-xxl)	28m 15s
slack-notifications / notify_slack	2s
	40m 6s

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