Add licenseId validation to POST /api/reactor

[bhalsey]

Add licenseId validation to POST /api/reactor

Description

The licenseId value should have length validation to provide users a helpful error message.

Observed versions

1.51.0

Affects versions

>= 1.26.0

Steps to reproduce

POST a value for licenseId that is > 255 to the Reactor API. /api/reactor

Alternatively, enter a long (> 255 chars) license key on the /admin/reactor/ page.
User sees "FusionAuth encountered an unexpected error. Please review the troubleshooting guide found in the documentation for assistance and the available support channels."

Expected behavior

The API caller should see a status code of 400 with a JSON response indicating the input value is too long. The admin UI should similarly show an error indicating the input is too long.