Update size cost model for J

Context

This MR rewrites the test for the size cost model because it was flaky.

This MR also updates some values of the size cost model that have changed.

Fixes #2500 (closed) #1834 (closed)

Manually testing the MR

dune exec src/proto_alpha/lib_protocol/test/integration/michelson/main.exe \
     -- test "^script typed ir size$"

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR