[4.0 -> main] Merge time summary fix to main

[linh2931]

Merge #947.

#776 assumed read-only transactions to only run on read-only threads. #901 changed that and read-only transactions can run on main thread too.

• Existing calculation of transient trxs time was done on the main thread. This is not correct any more as read-only trxs on the main thread in the read window will be double counted. The solution is to count transient time only in the write window (dry-run trxs only run in write window). This change makes the intention more clearer and safer, as in write window all processing is single threaded and no read-only threads are running.
• Refactored push_read_only_transaction for read-only tasks missed idle time accounting. Add it now.

A sample report looks like
debug 2023-04-02T20:36:41.903 nodeos producer_plugin.cpp:284 report ] Block #259 trx idle: 555758us out of 565688us, success: 0, 0us, fail: 0, 0us, transient: 14, 2281us, other: 7649us