fix read only nodeos read mode is IRREVERSIBLE terminate block can go futher than LIB 📦

[heifner]

Change Description

EPE 915

Port the changes in PR https://github.com/EOSIO/eos/pull/10260 into develop-boxed

When running nodeos in irreversible mode read-mode = irreversible, I would expect the terminate-at-block option to stop on an irreversible block not on a non-irreversible block.

The fix is add check in function producer_plugin_impl::start_block_result producer_plugin_impl::start_block() the check read_only and read-mode = irreversible condition

https://github.com/EOSIO/eos/pull/10676

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