fix: adds delay for the second test-set in serve cmd

[re-Tick]

Related Issue

• When I run multiple test-sets in test with the unit test integration, then the http requests are triggered before the user application is restarted.

Closes: #918

Describe the changes you've made

There is a firstRequestDone variable which is used to assign the delay to 1 for the simulation of requests. This PR removes that boolean so that the requests are triggered after the user application has been restarted in the unit-test integration. Also fixes the postgres issue to get the updated mocks each time before reading the next requests from postgres client.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Please let us know if any test cases are added

Tested changes with the go-test library.

Describe if there is any unusual behaviour of your code(Write NA if there isn't)

NA

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.