chore(repo): remove v16 migrations (#28220)

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Fixes #

Author: jaysoo

packages/angular/migrations.json

@@ -1,29 +1,5 @@
 {
   "generators": {
-    "update-16-0-0-add-nx-packages": {
-      "cli": "nx",
-      "version": "16.0.0-beta.1",
-      "description": "Replace @nrwl/cypress with @nx/cypress",
-      "implementation": "./src/migrations/update-16-0-0-add-nx-packages/update-16-0-0-add-nx-packages"
-    },
-    "update-16-2-0-normalize-tsconfigs": {
-      "cli": "nx",
-      "version": "16.2.0-beta.0",
-      "description": "Normalize tsconfig.cy.json files to be located at '<projectRoot>/cypress/tsconfig.json'",
-      "implementation": "./src/migrations/update-16-2-0/update-cy-tsconfig"
-    },
-    "update-16-3-0-remove-old-tsconfigs": {
-      "cli": "nx",
-      "version": "16.4.0-beta.10",
-      "description": "Remove tsconfig.e2e.json and add settings to project tsconfig.json. tsConfigs executor option is now deprecated. The project level tsconfig.json file should be used instead.",
-      "implementation": "./src/migrations/update-16-4-0/tsconfig-sourcemaps"
-    },
-    "update-16-8-0-cypress-13": {
-      "cli": "nx",
-      "version": "16.8.0-beta.4",
-      "description": "Update to Cypress v13. Most noteable change is video recording is off by default. This migration will only update if the workspace is already on Cypress v12. https://docs.cypress.io/guides/references/migration-guide#Migrating-to-Cypress-130",
-      "implementation": "./src/migrations/update-16-8-0/cypress-13"
-    },
     "update-cypress-version-13-6-6": {
       "cli": "nx",
       "version": "18.1.0-beta.3",
@@ -38,39 +14,6 @@
     }
   },
   "packageJsonUpdates": {
-    "16.1.0": {
-      "version": "16.1.0-beta.0",
-      "requires": {
-        "cypress": ">=12.0.0 <12.11.0"
-      },
-      "packages": {
-        "cypress": {
-          "version": "^12.11.0",
-          "alwaysAddToPackageJson": false
-        }
-      }
-    },
-    "16.5.0": {
-      "version": "16.5.0-beta.0",
-      "requires": {
-        "cypress": ">=12.0.0 <12.16.0"
-      },
-      "packages": {
-        "cypress": {
-          "version": "^12.16.0",
-          "alwaysAddToPackageJson": false
-        }
-      }
-    },
-    "16.7.0": {
-      "version": "16.7.0-beta.3",
-      "packages": {
-        "eslint-plugin-cypress": {
-          "version": "^2.13.4",
-          "alwaysAddToPackageJson": false
-        }
-      }
-    },
     "17.2.0-beta.2": {
       "version": "17.2.0-beta.2",
       "packages": {