[Jira] Update label for Jira cloud configuration (#186877)

## Summary

Add tooltip and update the label for the Jira cloud configuration.

### Checklist

Delete any items that are not applicable to this PR.

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)

### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: Artem Shelkovnikov <artem.shelkovnikov@elastic.co>
Co-authored-by: Artem Shelkovnikov <lavatroublebubble@gmail.com>
Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

packages/kbn-search-connectors/types/native_connectors.ts

@@ -1861,14 +1861,20 @@ export const NATIVE_CONNECTOR_DEFINITIONS: Record<string, NativeConnector | unde
         ],
         display: DisplayType.TEXTBOX,
         label: i18n.translate('searchConnectors.nativeConnectors.jira.cloudServiceAccountLabel', {
-          defaultMessage: 'Jira Cloud service account id',
+          defaultMessage: 'Jira Cloud email address',
         }),
         options: [],
         order: 6,
         placeholder: 'me@example.com',
         required: true,
         sensitive: false,
-        tooltip: null,
+        tooltip: i18n.translate(
+          'searchConnectors.nativeConnectors.jira.cloudServiceAccountTooltip',
+          {
+            defaultMessage:
+              'Email address associated with Jira Cloud account. E.g. jane.doe@gmail.com',
+          }
+        ),
         type: FieldType.STRING,
         ui_restrictions: [],
         validations: [],