[dependabot] Ignore all fixture directories

[poteto]

Stack from ghstack (oldest at bottom):

• -> [dependabot] Ignore all fixture directories #31074
• [dependabot] Remove stale directories from config #31073

Seems like we can specify a wildcard dependency name to ignore all
dependencies from being updated. As I understand it dependabot will
still run monthly but no PRs will be generated.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 26, 2024 2:25pm

[react-sizebot]

Comparing: b7f74f3...f27aa92

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.82 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	507.20 kB	507.20 kB	=	90.80 kB	90.80 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	512.13 kB	512.13 kB	=	91.52 kB	91.52 kB
facebook-www/ReactDOM-prod.classic.js	=	603.73 kB	603.73 kB	=	106.84 kB	106.83 kB
facebook-www/ReactDOM-prod.modern.js	=	579.95 kB	579.95 kB	=	102.92 kB	102.92 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 65f9009

[kassens]

I think we can simplify this a bunch using directories, per https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#directories

it should support wildcards for the plural version.

So something like

  - package-ecosystem: "npm"
    directories:
      - "/fixtures/*"
    schedule:
      interval: "monthly"
    ignore:
      - dependency-name: "*"

[poteto]

@kassens oh sweet, nice find!