GSUB Processor in UI cannot deal with spaces as values.

[philippkahr]

Kibana version: 8.15.0

Describe the bug:

Cannot create Gsub processor in ingest pipeline with a space as pattern. Over API it works, like this:

 {
        "gsub": {
          "field": "",
          "pattern": " ",
          "replacement": ""
        }
      } 

Steps to reproduce:

1. Create new pipeline
2. Select GSUB processor
3. Enter a single space symbol. Try to save.

Expected behavior: That I can replace space symbols with whatever I want.

Screenshots (if relevant):

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:

[elasticmachine]

Pinging @elastic/kibana-management (Team:Kibana Management)