fix: reject BlobTxs larger than 2 MiB #6294

Job	Run time
goreleaser / goreleaser-check	1m 40s
lint / golangci-lint	3m 38s
lint / yamllint	7s
markdown-linter / markdown-link-check	2m 54s
markdown-linter / markdown-lint	5s
test / test	10m 42s
test / test-coverage	2m 42s
test / test-fuzz	5m 43s
test / test-race	7m 44s
test / test-short	4m 5s
lint / hadolint / hadolint	14s
goreleaser / goreleaser	0s
	39m 34s

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