fixed swift Code (Tested)

[badnikhil]

PR Description

The swift code is fixed ,tests are updated and response is verified from other languages' codes.
Everything explained in the issue are fixed
Used Semaphore to wait for the async response and stop when response is recieved .It also prevent premature exits.

Tested with

swift-driver version: 1.115.1 Apple Swift version 6.0.3 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)
Target: arm64-apple-macosx15.0

Related Issues

• Closes wrong Swift Codegen (httpSession) #692

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I am using the latest Flutter stable branch (run flutter upgrade and verify)
• I have run related tests and all tests are passing

Added/updated tests?

We encourage you to add relevant test cases.

• Yes
• [] No,

OS on which you have developed and tested the feature?

• macOS (MacBook Air M1)

[ashitaprasad]

This was not expected from you @badnikhil - Why did it not occur to you that you modified the codegen template still no test was failing?
It was because the tests were skipped as they required manual verification.
Each and every generated output code has to be manually executed on the local system to ensure that the generated code runs for every test case.

[badnikhil]

This was not expected from you @badnikhil - Why did it not occur to you that you modified the codegen template still no test was failing? It was because the tests were skipped as they required manual verification. Each and every generated output code has to be manually executed on the local system to ensure that the generated code runs for every test case.

I am sorry for the haste. Actually I made this PR in hurry I will verify everything again.
I found the issue when I was working on pr #681 .. and I was planning to update tests cases in that so I was a bit confused

[badnikhil]

@ashitaprasad drafted this PR for now.. I will open this after working with tests.