Changes to the `Configurable` method `merge`

The changes applied to the merge method were made as a result of code profiling and result in a roughly 20-30s improvement in some ATLAS trigger jobs.

An new test was added in test_configurables_merge.py as a result of changes made to merge in order to increase test coverage.

@tbold @rbielski ATR-23200

Thanks @ktopolni. In addition to fixing the formatting issue, could you also please rewrite your commit history? Just squash all commits into one and then please also update the commit message to clearly say what has been changed. E.g. your changes only apply to the merge method. So that's more useful information than just saying "improve configuration time". Also explain why your changes result in an improvement (looks like it avoids unnecessary comparisons and maybe some reduction in function calls?). Also no need to reference an ATLAS-internal command. Just say that these changes result in a 20-30s reduction in configuration time in some ATLAS trigger jobs.

added 1 commit

• e8d80311 - Changes to the `Configurable` method `merge`

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changed title from Improve configuration time to {+Changes to the Configurable method merge+}

changed the description

resolved all threads

changed milestone to %v36r5

approved this merge request

added lhcb-gaudi-head label

assigned to @clemenci

• [2022-03-24 00:04] Validation started with lhcb-gaudi-head#3196
• [2022-03-24 00:34] Validation started with lhcb-run2-gaudi-head#295
• [2022-03-25 00:06] Validation started with lhcb-gaudi-head#3197
• [2022-03-25 00:39] Validation started with lhcb-run2-gaudi-head#296

merged

mentioned in commit a926b34a