chore: replace stale make calls with just

[ajsutton]

Summary

Audit and cleanup of remaining make references after the Make → Just migration (#19546).

• build-prestates.sh and build-legacy-cannons.sh: Use just when a justfile is present at the checked-out tag, fall back to make for older tags that predate the migration
• op-alt-da/Dockerfile and op-dispute-mon/Dockerfile: Update stale comments referencing make golang-docker → just golang-docker

Note: rust/op-reth/tests/ was already handled by #19525.

Test plan

• Verify build-prestates.sh still works for both old tags (no justfile → make) and new tags (justfile → just)
• Verify build-legacy-cannons.sh builds cannon embeds correctly across tag versions
• Confirm no other stale make references remain (audit checked CI configs, Dockerfiles, scripts, and docs)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.4%. Comparing base (ba64213) to head (e485c54).
⚠️ Report is 7 commits behind head on develop.

❗ There is a different number of reports uploaded between BASE (ba64213) and HEAD (e485c54). Click for more details.

HEAD has 19 uploads less than BASE

Flag	BASE (ba64213)	HEAD (e485c54)
contracts-bedrock-tests	16	0
unit	2	0
cannon-go-tests-64	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #19596      +/-   ##
===========================================
- Coverage     75.5%    66.4%    -9.2%     
===========================================
  Files          675       55     -620     
  Lines        71562     4030   -67532     
===========================================
- Hits         54071     2677   -51394     
+ Misses       17347     1209   -16138     
  Partials       144      144              

Flag	Coverage Δ
cannon-go-tests-64	66.4% <ø> (ø)
contracts-bedrock-tests	?
unit	?

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see 620 files with indirect coverage changes

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