Add workflow to validate dependabot config

[yurishkuro]

Which problem is this PR solving?

• Per title

Description of the changes

• new workflow
• fix existing breaks in the config

How was this change tested?

• CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.20%. Comparing base (4f12ffe) to head (5b59d98).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5556   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files         327      327           
  Lines       16021    16021           
=======================================
  Hits        15413    15413           
  Misses        432      432           
  Partials      176      176           

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	18.88% <ø> (ø)
elasticsearch-8.x-v1	19.09% <ø> (ø)
elasticsearch-8.x-v2	19.07% <ø> (-0.02%)	⬇️
grpc_v1	9.48% <ø> (ø)
grpc_v2	7.53% <ø> (ø)
kafka	9.77% <ø> (ø)
opensearch-1.x-v1	18.93% <ø> (-0.02%)	⬇️
opensearch-2.x-v1	18.94% <ø> (+0.01%)	⬆️
opensearch-2.x-v2	18.94% <ø> (+0.01%)	⬆️
unittests	94.08% <ø> (ø)

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[jkowall]

LGTM!