chore(linter): declare @nx/jest as optional peer dependency (#35377)

## Current Behavior


`packages/eslint/src/generators/workspace-rules-project/workspace-rules-project.ts:37`
calls `ensurePackage<typeof import('@nx/jest')>('@nx/jest', nxVersion)`.
This runtime-optional reference (type-only import plus a string
argument) is invisible to Nx's static project-graph analysis, so the
graph has no `@nx/eslint → @nx/jest` edge today.

Combined with the custom jest resolver in
`scripts/patched-jest-resolver.js` — which maps `@nx/jest` subpaths to
workspace source — the `eslint:test` task ends up reading
`packages/jest/index.ts` and 19 files under `packages/jest/src/**` at
module-load time. Those reads are undeclared inputs and are flagged as
sandbox violations by the staging sandbox reports.

## Expected Behavior

Declaring `@nx/jest` as an **optional** `peerDependency` of `@nx/eslint`
materializes the missing edge in Nx's project graph (the graph reader in
`explicit-package-json-dependencies.ts` walks `peerDependencies`
alongside `dependencies`). The inferred test-task input `^production` is
transitive, so `packages/jest/**` production source is then covered as
declared inputs of `eslint:test` and the 20 violations disappear.

`peerDependenciesMeta.@nx/jest.optional: true` keeps `@nx/jest` off the
user's install surface — package managers don't auto-install it and
don't warn about missing optional peers. Users who invoke the
`workspace-rules-project` generator with jest scaffolding still get
`@nx/jest` via the existing `ensurePackage` runtime install path,
unchanged.

Author: leosvelperez

packages/eslint/package.json

@@ -32,6 +32,7 @@
   "generators": "./generators.json",
   "executors": "./executors.json",
   "peerDependencies": {
+    "@nx/jest": "workspace:*",
     "@zkochan/js-yaml": "0.0.7",
     "eslint": "^8.0.0 || ^9.0.0 || ^10.0.0"
   },
@@ -46,6 +47,9 @@
     "nx": "workspace:*"
   },
   "peerDependenciesMeta": {
+    "@nx/jest": {
+      "optional": true
+    },
     "@zkochan/js-yaml": {
       "optional": true
     }

packages/eslint/tsconfig.lib.json

@@ -15,14 +15,17 @@
   ],
   "include": ["**/*.ts"],
   "references": [
-    {
-      "path": "../nx/tsconfig.lib.json"
-    },
     {
       "path": "../js/tsconfig.lib.json"
     },
     {
       "path": "../devkit/tsconfig.lib.json"
+    },
+    {
+      "path": "../nx/tsconfig.lib.json"
+    },
+    {
+      "path": "../jest/tsconfig.lib.json"
     }
   ]
 }