feat: add experiment name to VWO tracking data

[vwointegration]

What does this PR do?
This PR updates to also send the experiment name along with the existing experiment ID, variation name, and user ID.

Are there breaking changes in this PR?
No, this is a non-breaking change. Existing functionality remains the same; we are only adding an additional property (experimentName).

Testing
Testing completed successfully

• Verified locally by running the integration and confirming that the experimentName is included in the payload sent to Segment.
• Confirmed no regressions in the existing properties (experimentId, variationName, vwoUserId).

Any background context you want to provide?
Previously, only experiment ID, variation name, and VWO user ID were sent to Segment. Some customers requested the experiment name for easier reporting and debugging, so this enhancement adds that field.

Is there parity with the server-side/android/iOS integration components (if applicable)?
No change needed — this update is for the JavaScript integration only. (Parity can be considered for other SDKs later if required.)

Does this require a new integration setting? If so, please explain how the new setting works
No, no new settings are required. The additional property (experimentName) is included automatically in the payload.

[joe-ayoub-segment]

Hi @vwointegration thanks for the PR. This change is on our classic Integration platform, which we usually do not support.
However this seems like a minor change so we might be able to make an exception.
Can you please let me know how customers who have not asked for this change will be affected, if at all?

[vwointegration]

Hi @joe-ayoub-segment,

This change will not impact any other customers. We’ve only added an extra property to the current event, and it does not affect other data. All existing customer data will continue to work as it is, with no impact on them.