Input validation error regression

[paulgrainger85]

Describe the issue

Previously this was the error received when input validation failed 👍

As of v0.18 this is the error seen now 👎

Sample flow

id: regex-input
namespace: demo

inputs:
  - id: age
    type: INT
    defaults: 42
    required: false
    min: 18
    max: 64

  - id: user
    type: STRING
    defaults: student
    required: false
    validator: ^student(\d+)?$

tasks:
  - id: validator
    type: io.kestra.plugin.core.log.Log
    message: User {{ inputs.user }}, age {{ inputs.age }}

Environment

• Kestra Version: v0.18.2
• Operating System: Docker