Improve log poller codec usage and optimise log event discriminator matching #4279

Job	Run time
Check integration test compilation	4m 51s
Get ProjectSerum Version	2s
Check for contract changes	2s
E2E Custom Build Custom CL Image	3m 48s
Check If Solana Test Image Exists	6s
E2E Custom Build Artifacts	5m 26s
E2E Build Previous Release Artifacts	0s
E2E Custom Run Smoke Tests	10m 7s
Combine artifacts for upgrade test	0s
Build Test Image	0s
E2E Program Upgrade Tests	0s
	24m 22s

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