chore: enable errcheck and unparam linters for warehouse

[achettyiitr]

Description

• Enable errcheck and unparam linters for warehouse package. (PIPE-410)

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (19ca0f6) 70.52% compared to head (d78df76) 70.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3970      +/-   ##
==========================================
- Coverage   70.52%   70.50%   -0.02%     
==========================================
  Files         357      357              
  Lines       53673    53663      -10     
==========================================
- Hits        37851    37837      -14     
+ Misses      13566    13564       -2     
- Partials     2256     2262       +6     

Files	Coverage Δ
...ehouse/integrations/azure-synapse/azure-synapse.go	77.20% <100.00%> (+0.15%)	⬆️
warehouse/identity/identity.go	66.18% <80.00%> (ø)
warehouse/integrations/mssql/mssql.go	77.03% <50.00%> (+0.04%)	⬆️
warehouse/integrations/redshift/redshift.go	74.03% <50.00%> (+0.02%)	⬆️

... and 13 files with indirect coverage changes

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