Add manual DCO check using Python script dco-check

[yurishkuro]

Which problem is this PR solving?

• Several PRs are stuck with DCO check pending. Apparently there's an ongoing issue with the DCO app: DCO check stays as expected dcoapp/app#211

Description of the changes

• Add an alternative DCO check into the lint workflow using https://github.com/christophebedard/dco-check

How was this change tested?

Ran the script manually:

$ python3 scripts/dco_check.py -b main
Detected: git (default)

Checking commits: 5863430fa0c22679ff843abdd717ac8cf8fb6828..7a5e58b97d16f3ea024cb5da23442e6833798429

All good!

With an unsigned commit:

$ gca -m bad
[manual-dco-check 7da95684] bad
 1 file changed, 1 insertion(+)

$ python3 scripts/dco_check.py -b main
Detected: git (default)

Checking commits: 5863430fa0c22679ff843abdd717ac8cf8fb6828..7da95684408ebd3f32692e9444940bdf0e04348d

Missing sign-off(s):

	7da95684408ebd3f32692e9444940bdf0e04348d
		no sign-off found

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.20%. Comparing base (5863430) to head (58237ff).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5528      +/-   ##
==========================================
+ Coverage   96.19%   96.20%   +0.01%     
==========================================
  Files         327      327              
  Lines       16013    16013              
==========================================
+ Hits        15403    15405       +2     
+ Misses        435      434       -1     
+ Partials      175      174       -1     

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.93% <ø> (ø)
cassandra-3.x-v1	16.44% <ø> (ø)
cassandra-3.x-v2	1.85% <ø> (ø)
cassandra-4.x-v1	16.44% <ø> (ø)
cassandra-4.x-v2	1.85% <ø> (ø)
elasticsearch-7-v1	18.88% <ø> (ø)
elasticsearch-8-v1	19.07% <ø> (ø)
elasticsearch-8-v2	19.08% <ø> (ø)
grpc_v1	9.47% <ø> (ø)
grpc_v2	7.53% <ø> (ø)
kafka	9.78% <ø> (ø)
opensearch-1-v1	18.94% <ø> (ø)
opensearch-2-v1	18.94% <ø> (+0.01%)	⬆️
opensearch-2-v2	18.92% <ø> (-0.02%)	⬇️
unittests	93.89% <ø> (+0.01%)	⬆️

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