SCORU,Node: use Injector for operations on L1

Context

This MR introduces the injector for the SCORU node, and uses it to publish all operations on L1. This is based on !5692 (merged) and !5908 (merged). Fixes #2869 (closed)

Owner: @mebsout

Manually testing the MR

No new feature have been introduced, simply run the tests to check the commitments are correctly published:

dune exec tezt/tests/main.exe -- --verbose --file sc_rollup.ml commitment

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Provide automatic testing (see the testing guide).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR