feat: improve schema generator

[saikumarrs]

What are the changes introduced in this PR?

Improvements:

• Added a warning for missing fields in db-config.json but found in ui-config.json.
• Fixed the generation of the useNativeSDK field always.
• Fixed the issue where the schema is generated for a field even though it is not present in the db-config.json file.

Also, deleted duplicate enum value for a field in Snap Pixel destination.

What is the related Linear task?

Resolves INT-1591

Please explain the objectives of your changes below

Put down any required details on the broader aspect of your changes. If there are any dependent changes, mandatorily mention them here

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 checks got introduced or modified in test suites. Please explain the changes.

N/A

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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?

• I have executed schemaGenerator tests and updated schema if needed

• Are sensitive fields marked as secret in definition config?

• Is the PR limited to 10 file changes?

• Is the PR limited to one linear task?

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]

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