fix(deprecations): do not raise warnings for onboarding repos

lib/workers/repository/process/deprecated.js

@@ -3,7 +3,13 @@ module.exports = {
 };
 
 async function raiseDeprecationWarnings(config, packageFiles) {
-  if (config.suppressNotifications && config.suppressNotifications.includes('deprecationWarningIssues')) {
+  if (!config.repoIsOnboarded) {
+    return;
+  }
+  if (
+    config.suppressNotifications &&
+    config.suppressNotifications.includes('deprecationWarningIssues')
+  ) {
     return;
   }
   const deprecatedPackages = {};

test/workers/repository/process/__snapshots__/deprecated.spec.js.snap

@@ -8,7 +8,15 @@ Array [
 
 Please take the actions necessary to rename or substitute this deprecated package and commit to your base branch. If you wish to ignore this deprecation warning and continue using \`foo\` as-is, please add it to your [ignoreDeps](https://renovatebot.com/docs/configuration-options/#ignoredeps) array in Renovate config before closing this issue, otherwise another issue will be recreated the next time Renovate runs.
 
-Affected package file(s): \`package.json\`, \`frontend/package.json\`",
+Affected package file(s): \`package.json\`, \`frontend/package.json\`
+
+ Would you like to disable Renovate's deprecation warning issues? Add the following to your config:
+
+\`\`\`
+\\"suppressNotifications\\": [\\"deprecationWarningIssues\\"]
+\`\`\`
+
+",
   ],
 ]
 `;

test/workers/repository/process/deprecated.spec.js

@@ -4,14 +4,20 @@ const {
 
 describe('workers/repository/process/deprecated', () => {
   describe('raiseDeprecationWarnings()', () => {
+    it('returns if onboarding', async () => {
+      const config = {};
+      await raiseDeprecationWarnings(config, {});
+    });
     it('returns if disabled', async () => {
       const config = {
+        repoIsOnboarded: true,
         suppressNotifications: ['deprecationWarningIssues'],
       };
       await raiseDeprecationWarnings(config, {});
     });
     it('raises deprecation warnings', async () => {
       const config = {
+        repoIsOnboarded: true,
         suppressNotifications: [],
       };
       const packageFiles = {