[ci] Validate that generated mocks are up to date

[yurishkuro]

Which problem is this PR solving?

• We want mockery version to be up to date with the generated files.
• Bump github.com/vektra/mockery/v2 from 2.42.3 to 2.43.2 in /internal/tools #5563 upgrades mockery, but does not re-generate the files.

Description of the changes

• Add a lint check to the workflow for protobuf

How was this change tested?

• the step passed in the CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.20%. Comparing base (03136eb) to head (5404d36).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5568      +/-   ##
==========================================
- Coverage   96.21%   96.20%   -0.02%     
==========================================
  Files         327      327              
  Lines       16006    16006              
==========================================
- Hits        15400    15398       -2     
- Misses        431      432       +1     
- Partials      175      176       +1     

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.93% <ø> (ø)
cassandra-3.x-v1	16.45% <ø> (ø)
cassandra-3.x-v2	1.85% <ø> (ø)
cassandra-4.x-v1	16.45% <ø> (ø)
cassandra-4.x-v2	1.85% <ø> (ø)
elasticsearch-7.x-v1	18.89% <ø> (+0.01%)	⬆️
elasticsearch-8.x-v1	19.09% <ø> (ø)
elasticsearch-8.x-v2	19.09% <ø> (ø)
grpc_v1	9.47% <ø> (-0.02%)	⬇️
grpc_v2	7.53% <ø> (ø)
kafka	9.77% <ø> (ø)
opensearch-1.x-v1	18.94% <ø> (ø)
opensearch-2.x-v1	18.94% <ø> (+0.01%)	⬆️
opensearch-2.x-v2	18.94% <ø> (+0.01%)	⬆️
unittests	94.07% <ø> (-0.02%)	⬇️

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[jkowall]

LGTM!