Added eslint override for index.js false positives

- Unquestionably, at some point we need to rework the API code so that we have less stuff everywhere
- However, the max-lines index.js rule exists as a proxy to find index.js files which are not exposing Public API, but rather contain logic
- These 6 cases are all valid index.js files as the expose the Public API of the module
- Therefore, I've added an override and an override notice explaining.

core/server/api/canary/index.js

@@ -1,6 +1,12 @@
 const shared = require('../shared');
 const localUtils = require('./utils');
 
+// ESLint Override Notice
+// This is a valid index.js file - it just exports a lot of stuff!
+// Long term we would like to change the API architecture to reduce this file,
+// but that's not the problem the index.js max - line eslint "proxy" rule is there to solve.
+/* eslint-disable max-lines */
+
 module.exports = {
     get http() {
         return shared.http;

core/server/api/canary/utils/serializers/output/index.js

@@ -1,3 +1,9 @@
+// ESLint Override Notice
+// This is a valid index.js file - it just exports a lot of stuff!
+// Long term we would like to change the API architecture to reduce this file,
+// but that's not the problem the index.js max - line eslint "proxy" rule is there to solve.
+/* eslint-disable max-lines */
+
 module.exports = {
     get all() {
         return require('./all');

core/server/api/v2/index.js

@@ -1,6 +1,12 @@
 const shared = require('../shared');
 const localUtils = require('./utils');
 
+// ESLint Override Notice
+// This is a valid index.js file - it just exports a lot of stuff!
+// Long term we would like to change the API architecture to reduce this file,
+// but that's not the problem the index.js max - line eslint "proxy" rule is there to solve.
+/* eslint-disable max-lines */
+
 module.exports = {
     get http() {
         return shared.http;

core/server/api/v2/utils/serializers/output/index.js

@@ -1,3 +1,9 @@
+// ESLint Override Notice
+// This is a valid index.js file - it just exports a lot of stuff!
+// Long term we would like to change the API architecture to reduce this file,
+// but that's not the problem the index.js max - line eslint "proxy" rule is there to solve.
+/* eslint-disable max-lines */
+
 module.exports = {
     get all() {
         return require('./all');

core/server/api/v3/index.js

@@ -1,6 +1,12 @@
 const shared = require('../shared');
 const localUtils = require('./utils');
 
+// ESLint Override Notice
+// This is a valid index.js file - it just exports a lot of stuff!
+// Long term we would like to change the API architecture to reduce this file,
+// but that's not the problem the index.js max - line eslint "proxy" rule is there to solve.
+/* eslint-disable max-lines */
+
 module.exports = {
     get http() {
         return shared.http;

core/server/api/v3/utils/serializers/output/index.js

@@ -1,3 +1,9 @@
+// ESLint Override Notice
+// This is a valid index.js file - it just exports a lot of stuff!
+// Long term we would like to change the API architecture to reduce this file,
+// but that's not the problem the index.js max - line eslint "proxy" rule is there to solve.
+/* eslint-disable max-lines */
+
 module.exports = {
     get all() {
         return require('./all');