Check for infinity in eip-196 ecmul

[garyschulte]

PR description

Fixed Issue(s)

Highlighted by arewefastyet report, this PR addresses a recent regression in performance for eip-196 scalar multiplication when the point is at infinity

local testing shows significant improvement for these benchmarks:

	24.6.0	24.7.1	24.8.0	24.8-develop
EcMulInfinities2Scalar	1455.8	381.58	390.36	2526.56
EcMulInfinities32ByteScalar	1246.28	242.1	245.67	2478.99

related to #7542

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• Checked out our contribution guidelines?
• Considered documentation and added the doc-change-required label to this PR if updates are required.
• Considered the changelog and included an update if required.
• For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests

Locally, you can run these tests to catch failures early:

• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests

[pinges]

LGTM

[garyschulte]

waiting on fuzz testing results before merging