Fixed "See full error" on error toast

[Machi3mfl]

Hi Team,
This PR resolves and error when user click on "See full error" button on error toast.
Closes #4030

[Desvelao]

issue: if the method is static to the class, this is not accessible by the class instance.

suggestion: Use the class name instead of this to use the method.

Explanation:

// Define a class
class MyClass{
  // Constructor of the class instances
  constructor(){
    // Initialize the class instance. `this` keyword does reference to the class instance
  }
  // Define a static method for the class
  static staticMethod(){
    // This method is static of the class. This can't be accesed by the class instance.
    // Use:
    // MyClass.staticMethod();
  }
  
  // Define a method accesible by the class instance throught the prototype chain
  methodAccesibleByTheClassInstance(){
    // This method is in the prototype chain of the class instance, so this is accesible.
    // Use:
    // this.methodAccesibleByTheClassInstance();
  }
}

nitpick: The method name has a typo Erro instead of Error.

[Desvelao]

thought: I am not sure that the proposed solution is good. It modified the thrown error in the WzRequest service, so the See the full error button in theory, should work. But, the problem with the button could appear if the error has no the expected interface.

As @Machi3mfl mentioned in this comment #4030 (comment) for the long term solution, we should adopt the same interface for the errors. This will need an analisys of the solution and the changes could break some things.

My proposed solution is sure the parameter used by the service that displays the toast, has the expected interface, regardless if the error is a string or an object valid to use in the toast. With this solution, we secure the button should work with different error interfaces.

[Mayons]

Test OK !

[github-actions]

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[mauceballos]

Test kibana 7.10 OK