fix: reject BlobTxs larger than 2 MiB #6301

Job	Run time
goreleaser / goreleaser-check	1m 40s
lint / golangci-lint	3m 5s
markdown-linter / markdown-link-check	2m 21s
lint / yamllint	7s
test / test	10m 44s
markdown-linter / markdown-lint	8s
test / test-coverage	5m 14s
test / test-fuzz	5m 40s
test / test-race	7m 39s
test / test-short	3m 56s
lint / hadolint / hadolint	9s
goreleaser / goreleaser	0s
	40m 43s

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