B2OC: a few tuning of Hlt2/Spruce lines, modernization of code, add 2 Hlt2 lines with neutrals

https://gitlab.cern.ch/lhcb-dpa/project/-/issues/243

patch generated by https://gitlab.cern.ch/lhcb/Moore/-/jobs/25218426

assigned to @abertoli and @shunan

added RTA label

requested review from @frodrigu

hello @frodrigu (cc @shunan @smalde @tevans), this is a MR targeting master with many updates from B2OC, on Hlt2 and Spruce

can you start the CI tests ?

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I have just checked that there are no conflicts (approve/unapprove)

added DPA-WP1 label

added B2OC label

/ci-test

changed the description

added ci-test-triggered label

• [2023-05-16 11:17] Validation started with lhcb-master-mr#7870

added hlt2-throughput-decreased label

resolved all threads

approved this merge request

resolved all threads

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