fix: reject BlobTxs larger than 2 MiB #6343

Job	Run time
lint / golangci-lint	3m 25s
lint / yamllint	13s
goreleaser / goreleaser-check	1m 39s
markdown-linter / markdown-link-check	2m 37s
markdown-linter / markdown-lint	32s
test / test	11m 3s
test / test-fuzz	5m 38s
test / test-race	7m 50s
test / test-short	4m 6s
test / test-coverage	5m 25s
lint / hadolint / hadolint	8s
goreleaser / goreleaser	0s
	42m 36s

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