refactor(core-blockchain): break loop if block contains v1 transaction

[spkjp]

We already call blockContainsIncompatibleTransactions which ensures that a block cannot contain mixed versions. So it is safe to assume that all following transactions are the same.

What kind of change does this PR introduce?

• Bugfix
• Feature
• Refactor
• Performance
• Tests
• Build
• Documentation
• Code style update
• Continuous Integration
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

Does this PR release a new version?

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch
• All tests are passing
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

[codecov-io]

Codecov Report

Merging #2914 into develop will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff            @@
##           develop    #2914   +/-   ##
========================================
  Coverage    68.13%   68.13%           
========================================
  Files          406      406           
  Lines         9774     9774           
  Branches       466      466           
========================================
  Hits          6660     6660           
  Misses        3076     3076           
  Partials        38       38

Impacted Files	Coverage Δ
...s/core-blockchain/src/processor/block-processor.ts	85.45% <50%> (ø)	⬆️

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