Revert frontend changes

- Revert frontend changes in
gitlab.com/gitlab-org/gitlab/-/merge_requests/26171
- Type in iid arguments reverted to String

app/assets/javascripts/mr_popover/queries/merge_request.query.graphql

-query mergeRequest($projectPath: ID!, $mergeRequestIID: ID!) {
+query mergeRequest($projectPath: ID!, $mergeRequestIID: String!) {
   project(fullPath: $projectPath) {
     mergeRequest(iid: $mergeRequestIID) {
       createdAt

app/assets/javascripts/sidebar/queries/sidebarDetails.query.graphql

-query ($fullPath: ID!, $iid: ID!) {
+query ($fullPath: ID!, $iid: String!) {
   project (fullPath: $fullPath) {
     issue (iid: $iid) {
       iid

app/assets/javascripts/sidebar/queries/sidebarDetailsForHealthStatusFeatureFlag.query.graphql

-query ($fullPath: ID!, $iid: ID!) {
+query ($fullPath: ID!, $iid: String!) {
   project (fullPath: $fullPath) {
     issue (iid: $iid) {
       iid

app/graphql/mutations/issues/base.rb

@@ -9,7 +9,7 @@ module Mutations
                required: true,
                description: "The project the issue to mutate is in"
 
-      argument :iid, GraphQL::ID_TYPE,
+      argument :iid, GraphQL::STRING_TYPE,
                required: true,
                description: "The iid of the issue to mutate"
 

doc/api/graphql/reference/gitlab_schema.graphql

@@ -3757,7 +3757,7 @@ input IssueSetConfidentialInput {
   """
   The iid of the issue to mutate
   """
-  iid: ID!
+  iid: String!
 
   """
   The project the issue to mutate is in
@@ -3802,7 +3802,7 @@ input IssueSetDueDateInput {
   """
   The iid of the issue to mutate
   """
-  iid: ID!
+  iid: String!
 
   """
   The project the issue to mutate is in
@@ -3842,7 +3842,7 @@ input IssueSetWeightInput {
   """
   The iid of the issue to mutate
   """
-  iid: ID!
+  iid: String!
 
   """
   The project the issue to mutate is in
@@ -8112,7 +8112,7 @@ input UpdateIssueInput {
   """
   The iid of the issue to mutate
   """
-  iid: ID!
+  iid: String!
 
   """
   The project the issue to mutate is in

doc/api/graphql/reference/gitlab_schema.json

@@ -10768,7 +10768,7 @@
                 "name": null,
                 "ofType": {
                   "kind": "SCALAR",
-                  "name": "ID",
+                  "name": "String",
                   "ofType": null
                 }
               },
@@ -10898,7 +10898,7 @@
                 "name": null,
                 "ofType": {
                   "kind": "SCALAR",
-                  "name": "ID",
+                  "name": "String",
                   "ofType": null
                 }
               },
@@ -11028,7 +11028,7 @@
                 "name": null,
                 "ofType": {
                   "kind": "SCALAR",
-                  "name": "ID",
+                  "name": "String",
                   "ofType": null
                 }
               },
@@ -24526,7 +24526,7 @@
                 "name": null,
                 "ofType": {
                   "kind": "SCALAR",
-                  "name": "ID",
+                  "name": "String",
                   "ofType": null
                 }
               },

doc/development/api_graphql_styleguide.md

@@ -547,7 +547,7 @@ argument :project_path, GraphQL::ID_TYPE,
          required: true,
          description: "The project the merge request to mutate is in"
 
-argument :iid, GraphQL::ID_TYPE,
+argument :iid, GraphQL::STRING_TYPE,
          required: true,
          description: "The iid of the merge request to mutate"
 

ee/app/assets/javascripts/design_management/graphql/queries/getDesign.query.graphql

 #import "../fragments/design.fragment.graphql"
 #import "~/graphql_shared/fragments/author.fragment.graphql"
 
-query getDesign($fullPath: ID!, $iid: ID!, $atVersion: ID, $filenames: [String!]) {
+query getDesign($fullPath: ID!, $iid: String!, $atVersion: ID, $filenames: [String!]) {
   project(fullPath: $fullPath) {
     id
     issue(iid: $iid) {

ee/app/assets/javascripts/design_management/graphql/queries/permissions.query.graphql

-query permissions($fullPath: ID!, $iid: ID!) {
+query permissions($fullPath: ID!, $iid: String!) {
   project(fullPath: $fullPath) {
     id
     issue(iid: $iid) {

ee/app/assets/javascripts/design_management/graphql/queries/project.query.graphql

 #import "../fragments/designList.fragment.graphql"
 #import "../fragments/version.fragment.graphql"
 
-query project($fullPath: ID!, $iid: ID!, $atVersion: ID) {
+query project($fullPath: ID!, $iid: String!, $atVersion: ID) {
   project(fullPath: $fullPath) {
     id
     issue(iid: $iid) {

ee/app/assets/javascripts/sidebar/queries/sidebarDetails.query.graphql

-query ($fullPath: ID!, $iid: ID!) {
+query ($fullPath: ID!, $iid: String!) {
   project (fullPath: $fullPath) {
     issue (iid: $iid) {
       iid

ee/app/assets/javascripts/sidebar/queries/sidebarDetailsForHealthStatusFeatureFlag.query.graphql

-query ($fullPath: ID!, $iid: ID!) {
+query ($fullPath: ID!, $iid: String!) {
   project (fullPath: $fullPath) {
     issue (iid: $iid) {
       healthStatus