test: cover actions with all prerendered pages

[statxc]

Adds a regression test for astro:actions to ensure projects with an adapter and all pages prerendered can still use action RPC routes in dev and build.

Fixes:#16256

Changes

• Adds regression coverage for astro:actions when an adapter is configured and all project pages are prerendered.
• Adds a minimal fixture with output: "server", an adapter, one prerendered page, and an action RPC route.
• Verifies both dev and build behavior for the action RPC endpoint.

Testing

• pnpm -C packages/astro build
• pnpm -C packages/astro exec astro-scripts test "test/actions.test.ts" --strip-types --match "Astro Actions with adapter and all project pages prerendered" --timeout 180000 --force-exit
• pnpm -C packages/astro exec astro-scripts test "test/actions.test.ts" --strip-types --timeout 300000 --force-exit

Docs

No docs changes needed. This only adds regression test coverage for existing astro:actions behavior.

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[statxc]

Hi @ematipico , @alexanderniebuhr how are you? Please review this. I also have some personal questions regarding contribution. Can we contact on telegram or other community?

[alexanderniebuhr]

https://astro.build/chat/ is the only official community we use

[statxc]

Hi @alexanderniebuhr could you please review this?