Update to specify broadcastId for triggering broadcast, remove /api in path

[washam-cio]

MESS-710: Update Node SDK broadcast ID support and remove /api path

Updates:

• This updates api path, removing /api portion
• Specifies broadcastId, to avoid confusion with campaign ID, which tripped me up.
• Fixes test that failed in Node 19+ (latest is 25)

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Note

Medium Risk
Changes the triggerBroadcast request URL (and its documented parameter naming), which can break integrations relying on the previous /api/campaigns/:id/triggers path. Test adjustment is low risk but the endpoint change affects runtime behavior.

Overview
Updates APIClient.triggerBroadcast to treat the first argument as a broadcast ID (renamed to broadcastId) and to POST to the new endpoint POST /campaigns/:broadcastId/triggers (removing the previous /api/campaigns/... prefix).

Refreshes documentation and unit tests to match the new path, and loosens the bad-JSON parsing assertion in test/request.ts to be compatible with newer Node.js error message variations.

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