[ui] Updates for dependabot, upgrade yarn (#17255)

## Summary & Motivation

Dependabot has surfaced several issues:

- https://github.com/dagster-io/dagster/security/dependabot/342
- https://github.com/dagster-io/dagster/security/dependabot/337
- https://github.com/dagster-io/dagster/security/dependabot/334

Resolve these by bumping dependencies as needed, and by deleting
`@dagster-io/react-scripts` from `app-oss`, where it is no longer
needed.

Also run `yarn set version stable` in these projects to get things up to
date there as well.

## How I Tested These Changes

Run `yarn build` in `dagster-ui`, verify that the app builds correctly.

Buildkite.

docs/dagster-university/.yarnrc.yml

@@ -1,3 +1,3 @@
 nodeLinker: node-modules
 
-yarnPath: .yarn/releases/yarn-3.6.3.cjs
+yarnPath: .yarn/releases/yarn-3.6.4.cjs

docs/dagster-university/package.json

@@ -45,5 +45,5 @@
     "tailwindcss": "^3.3.3",
     "typescript": "latest"
   },
-  "packageManager": "[email protected].3"
+  "packageManager": "[email protected].4"
 }

docs/next/.yarnrc.yml

@@ -1,3 +1,3 @@
 nodeLinker: node-modules
 
-yarnPath: .yarn/releases/yarn-3.5.1.cjs
+yarnPath: .yarn/releases/yarn-3.6.4.cjs

docs/next/package.json

@@ -56,7 +56,6 @@
     "remark-frontmatter": "^3.0.0",
     "remark-macro": "^1.0.7",
     "remark-mdx": "^1.6.22",
-    "remark-mdx-metadata": "^1.0.1",
     "tailwindcss": "^2.0.3",
     "to-vfile": "^6.1.0",
     "ts-node": "^9.1.1",
@@ -80,5 +79,5 @@
     "remark-preset-prettier": "^0.4.1",
     "typescript": "5.0.4"
   },
-  "packageManager": "yarn@3.5.1"
+  "packageManager": "yarn@3.6.4"
 }