fix: [Stateful:Connectors:New connector page]Configuration form missi…

…ng instructions and field names from announcement (#197963)

Closes: #197586

## Description
Forms, requiring user input, should have clear instructions on how to
fill them. Specific fields can have their own help (guidance) text on
how to fill them with examples.
All fields which are present in the form can be programmatically
determined, especially for the users using assistive technology to
understand what fields are present, what input is expected.

## What was changed: 
1. `aria-label` values ​​are explicitly set for
`ConnectorConfigurationField` child components. I suspect that due to
the dynamic nature of this component, the standard mechanism does not
work properly.


## Screen: 

<img width="1163" alt="image"
src="https://github.com/user-attachments/assets/00e1bd87-30b3-4c8f-a3d7-0c7774028a66">

packages/kbn-search-connectors/components/configuration/connector_configuration_field.tsx

@@ -52,7 +52,7 @@ export const ConfigInputField: React.FC<ConfigInputFieldProps> = ({
   isLoading,
   validateAndSetConfigValue,
 }) => {
-  const { isValid, required, placeholder, value } = configEntry;
+  const { isValid, required, placeholder, value, label } = configEntry;
   const [innerValue, setInnerValue] = useState(value);
   return (
     <EuiFieldText
@@ -65,6 +65,7 @@ export const ConfigInputField: React.FC<ConfigInputFieldProps> = ({
         validateAndSetConfigValue(event.target.value);
       }}
       placeholder={placeholder}
+      aria-label={label}
     />
   );
 };
@@ -74,7 +75,7 @@ export const ConfigInputTextArea: React.FC<ConfigInputFieldProps> = ({
   configEntry,
   validateAndSetConfigValue,
 }) => {
-  const { isValid, required, placeholder, value } = configEntry;
+  const { isValid, required, placeholder, value, label } = configEntry;
   const [innerValue, setInnerValue] = useState(value);
   return (
     <EuiTextArea
@@ -88,6 +89,7 @@ export const ConfigInputTextArea: React.FC<ConfigInputFieldProps> = ({
         validateAndSetConfigValue(event.target.value);
       }}
       placeholder={placeholder}
+      aria-label={label}
     />
   );
 };
@@ -129,7 +131,7 @@ export const ConfigInputPassword: React.FC<ConfigInputFieldProps> = ({
   configEntry,
   validateAndSetConfigValue,
 }) => {
-  const { required, value } = configEntry;
+  const { required, value, label } = configEntry;
   const [innerValue, setInnerValue] = useState(value);
   return (
     <EuiFieldPassword
@@ -141,6 +143,7 @@ export const ConfigInputPassword: React.FC<ConfigInputFieldProps> = ({
         setInnerValue(event.target.value);
         validateAndSetConfigValue(event.target.value);
       }}
+      aria-label={label}
     />
   );
 };
@@ -170,6 +173,7 @@ export const ConnectorConfigurationField: React.FC<ConnectorConfigurationFieldPr
           onChange={(event) => {
             validateAndSetConfigValue(event.target.value);
           }}
+          aria-label={label}
         />
       ) : (
         <EuiRadioGroup
@@ -180,6 +184,7 @@ export const ConnectorConfigurationField: React.FC<ConnectorConfigurationFieldPr
           onChange={(id) => {
             validateAndSetConfigValue(id);
           }}
+          aria-label={label}
         />
       );
 
@@ -227,6 +232,7 @@ export const ConnectorConfigurationField: React.FC<ConnectorConfigurationFieldPr
                     onChange={(event) => {
                       validateAndSetConfigValue(event.target.checked);
                     }}
+                    aria-label={label}
                   />
                 </EuiFlexItem>
                 {!hasPlatinumLicense && (