Retain messageId if exists (allow overriding)

[silesky]

This addresses an inconsistency with analytics-node (new vs old).

There are cases valid use cases where we want the messageId to be overridable, such as deduping.

This ensures backward compatibility with analytics-node by modifying '@segment/analytics-core'. Specifically, the changes prevent the generation of a messageId if it is already set. This adjustment aligns with the behavior outlined in analytics-node's source code here.

While this is a core release, only the node library is affected, as the browser has its own EventFactory atm.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 33464cd00170ad7915825a81340a0fc3dc31ea3f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | ----------------------- | ----- | | @segment/analytics-core | Patch | | @segment/analytics-node | Minor | | @segment/analytics-next | Patch |

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