feat: add delivery_category as part of contents, remove flattening custom_data in FB conversions

[sandeepdsvs]

Description of the change

Resolves INT-981

• Added support for delivery_category parameter as part of contents in custom_data.
• Remove FlattenJSON on message.properties before setting them in custom_data
• Updated the API version to v18.0

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Fix #1

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers mentioned in a comment
• Changes have been reviewed by at least one other engineer
• Issue from task tracker has a link to this pull request

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7b17293) 87.15% compared to head (34d3e4a) 87.11%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2812      +/-   ##
===========================================
- Coverage    87.15%   87.11%   -0.05%     
===========================================
  Files          765      768       +3     
  Lines        28442    28622     +180     
  Branches      6659     6712      +53     
===========================================
+ Hits         24790    24933     +143     
- Misses        3315     3346      +31     
- Partials       337      343       +6     

Files	Coverage Δ
src/v0/destinations/facebook_conversions/config.js	100.00% <100.00%> (ø)
.../v0/destinations/facebook_conversions/transform.js	80.55% <100.00%> (ø)
src/v0/destinations/facebook_conversions/utils.js	76.53% <100.00%> (ø)

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[Gauravudia]

LGTM

[shrouti1507]

Added support for delivery_category parameter as part of contents in custom_data.

Please add test case regarding this

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication