Extend CreateUI Test Coverage

[dciborow]

Textboxes-With-Length-Constrains-Regex should not fail when length constraint is in the middle.

          {
            "name": "issuerProvider",
            "type": "Microsoft.Common.TextBox",
            "label": "Custom Issuer Provider",
            "toolTip": "certificate Issuer Provider",
            "visible": "[equals(steps('Security').issuerProviderDropDown, 'Custom')]",
            "defaultValue": "",
            "constraints": {
              "validations": [
                {
                  "regex": "^[A-Za-z][A-Za-z0-9-]{1,61}[A-Za-z0-9]$",
                  "message": "The certificate issuer can only contain alphanumeric values, and hyphens, but may not end with a hyphen."
                }
              ]
            }          
          }

[dciborow]

When I tried to reproduce, it passed.