core/bcast: broadcast either blinded or full block

[gsora]

Check what type of proposal we're broadcasting before calling SubmitProposal.

category: bug ticket: none

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 62.50000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 56.80%. Comparing base (d6b0d7a) to head (17c38ee). Report is 3 commits behind head on main.

Files	Patch %	Lines
core/bcast/bcast.go	62.50%	9 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3144 +/- ## ========================================== - Coverage 56.83% 56.80% -0.04% ========================================== Files 208 208 Lines 29314 29336 +22 ========================================== + Hits 16662 16665 +3 - Misses 10811 10828 +17 - Partials 1841 1843 +2 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud