feat: do not start up validator if fraud was reported

[daniel-savu]

Description

Builds on top of #4587

Adds a check in the CheckpointSubmitter builder which emits a panic if a reorg flag was posted, since this potentially signals fraud

Drive-by changes

CheckpointSubmitter::build was made private, so any use of it is now replaced by the build_and_submit flow

Related issues

Backward compatibility

Yes

Testing

Unit Tests - which is enough as long as CheckpointSubmitter::build is kept private

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0e4576e

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.89%. Comparing base (8809f37) to head (0e4576e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4627   +/-   ##
=======================================
  Coverage   73.89%   73.89%           
=======================================
  Files         100      100           
  Lines        1421     1421           
  Branches      180      180           
=======================================
  Hits         1050     1050           
  Misses        350      350           
  Partials       21       21           

Components	Coverage Δ
core	84.61% <ø> (ø)
hooks	75.71% <ø> (ø)
isms	79.20% <ø> (ø)
token	88.23% <ø> (ø)
middlewares	77.39% <ø> (ø)