Update custom role delete modal to account for multiple role assignments

[legrego]

We present users with a model when deleting custom roles within our serverless offering. Here are mockups of what it looks like today:

Now that we support multiple role assignments, we should update the language to indicate that the user may lose access, depending on their other role assignments.

diff --git a/x-pack/plugins/security/public/management/roles/roles_grid/confirm_delete/confirm_delete.tsx b/x-pack/plugins/security/public/management/roles/roles_grid/confirm_delete/confirm_delete.tsx
index bc434f61dab..f67889244ed 100644
--- a/x-pack/plugins/security/public/management/roles/roles_grid/confirm_delete/confirm_delete.tsx
+++ b/x-pack/plugins/security/public/management/roles/roles_grid/confirm_delete/confirm_delete.tsx
@@ -83,7 +83,7 @@ export class ConfirmDelete extends Component<Props, State> {
                   <p>
                     <FormattedMessage
                       id="xpack.security.management.roles.confirmDelete.serverless.removingRolesDescription"
-                      defaultMessage="Users with the following roles assigned will lose access to the project:"
+                      defaultMessage="Users with the following roles assigned may lose access to the project if they are not assigned any other roles:"
                     />
                   </p>
                 )}
@@ -99,7 +99,7 @@ export class ConfirmDelete extends Component<Props, State> {
                   <p>
                     <FormattedMessage
                       id="xpack.security.management.roles.confirmDelete.serverless.removingSingleRoleDescription"
-                      defaultMessage="Users with the {roleName} role assigned will lose access to the project."
+                      defaultMessage="Users with the {roleName} role assigned may lose access to the project if they are not assigned any other roles."
                       values={{ roleName: rolesToDelete[0] }}
                     />
                   </p>

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)