[Malleability] cluster.Block type ID method malleable.

[AndriiDiachuk]

closes: #6660

Context

This PR fixes the implementation of the ID() method for the cluster.Block type to cover all fields as it's used through the codebase.
Changes have no impact on tests.

Not for review yet.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 43.77%. Comparing base (91bef99) to head (eaf42c9).

Files with missing lines	Patch %	Lines
model/cluster/block.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feature/malleability    #6983      +/-   ##
========================================================
+ Coverage                 41.15%   43.77%   +2.62%     
========================================================
  Files                      2122     1033    -1089     
  Lines                    187214    96735   -90479     
========================================================
- Hits                      77055    42350   -34705     
+ Misses                   103718    50988   -52730     
+ Partials                   6441     3397    -3044     

Flag	Coverage Δ
unittests	43.77% <0.00%> (+2.62%)	⬆️

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[AndriiDiachuk]

The current type will be moved to Malleability C as it's similar to the flow.Block type and will need a bigger scope of changes.