fix(test): added unit test for db(pg)

[madhavilosetty-intel]

PR Checklist

• Unit Tests have been added for new changes
• API tests have been updated if applicable
• All commented code has been removed
• If you've added a dependency, you've ensured license is compatible with Apache 2.0 and clearly outlined the added dependency.

What are you changing?

Added unit tests for database(postgres) interactions

Anything the reviewer should know when reviewing this PR?

If the there are associated PRs in other repositories, please link them here (i.e. open-amt-cloud-toolkit/repo#365 )

[codecov-commenter]

Codecov Report

Merging #430 (9e71c2c) into main (5db2b6c) will increase coverage by 1.87%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #430      +/-   ##
==========================================
+ Coverage   24.94%   26.81%   +1.87%     
==========================================
  Files          69       69              
  Lines        3757     3759       +2     
  Branches      804      804              
==========================================
+ Hits          937     1008      +71     
+ Misses       2435     2371      -64     
+ Partials      385      380       -5     

Impacted Files	Coverage Δ
src/data/postgres/tables/device.ts	100.00% <100.00%> (+92.59%)	⬆️
src/data/postgres/index.ts	100.00% <0.00%> (+53.84%)	⬆️
src/utils/MPSValidationError.ts	100.00% <0.00%> (+83.33%)	⬆️

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