Refactors workflows engine loop (#14375)

* Refactors workflows engine loop

* Adds changeset + fixes lint

* Adds mutex

* Fixes tests - WIP

* Improves locking handling for goroutines

* Fixes lint

* Fixes tests

* Adds support for multi-branch steps workflows

* Fixes lint issue

* Improves error

* Improves workflow processed check logic

* Properly propagates states to step dependants

* Generates proper workflow status on workflow being processed

* Validates for workflow timeout before validating processed status

* Fixes tests nil-pointer deference

* Fixes merge update issue

* Addresses review comments

* Addresses review comments

* Fixes status propagation to step dependents

* Adds defensive lock-check

.changeset/khaki-pants-melt.md

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+"chainlink": patch
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+#updated Workflows Engine loop refactored