feat: upgrade adjust source to v2 spec

[vinayteki95]

What are the changes introduced in this PR?

This PR aims to upgrade webhook source adjust to listen to v2 specification instead of v0/v1 specification.

• Corresponding component tests are also modified to use v2 specification

What is the related Linear task?

Resolves INT-2899
But only partially

Please explain the objectives of your changes below

This is required to avoid using new environment variables that carry a list of sources which need to parse query_parameters from the body of v0/v1 sources in transformer while doing a v2->v1/v0 conversion.

Any changes to existing capabilities/behaviour, mention the reason & what are the changes ?

N/A

Any new dependencies introduced with this change?

N/A

Any new generic utility introduced or modified. Please explain the changes.

N/A

Any technical or performance related pointers to consider with the change?

N/A

@coderabbitai review

---

Developer checklist

• My code follows the style guidelines of this project

• No breaking changes are being introduced.

• All related docs linked with the PR?

• All changes manually tested?

• Any documentation changes needed with this change?

• Is the PR limited to 10 file changes?

• Is the PR limited to one linear task?

• Are relevant unit and component test-cases added in new readability format?

Reviewer checklist

• Is the type of change in the PR title appropriate as per the changes?

• Verified that there are no credentials or confidential data exposed with the changes.

[devops-github-rudderstack]

Test report for this run is available at: https://test-integrations-dev.s3.amazonaws.com/integrations-test-reports/rudder-transformer/3911/test-report.html

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.47%. Comparing base (275e971) to head (b3d9aab).
Report is 20 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/v2/sources/adjust/transform.js	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3911      +/-   ##
===========================================
- Coverage    90.47%   90.47%   -0.01%     
===========================================
  Files          615      615              
  Lines        32320    32320              
  Branches      7677     7681       +4     
===========================================
- Hits         29242    29241       -1     
- Misses        2822     2823       +1     
  Partials       256      256              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sonarqubecloud]

Quality Gate failed

Failed conditions
5 New Major Issues (required ≤ 1)
6 New Code Smells (required ≤ 1)

See analysis details on SonarQube Cloud

Catch issues before they fail your Quality Gate with our IDE extension SonarQube for IDE