Add caching to PulumiGetStackOutputService with skipCache option

[Copilot]

Pulumi stack output queries are slow. This adds caching to avoid repeated CLI invocations.

Changes

• Cache storage: .webiny/caches/stack-output/{appName}-{env}-{region}-{variant}.json
• Added skipCache parameter to PulumiGetStackOutputService.Params to bypass/refresh cache
• Auto-refresh on deploy: DeployApp now calls the service with skipCache: true after successful deployments
• Implementation: Async file I/O, handles race conditions with recursive mkdir, graceful cache miss handling

Usage

// Normal usage - reads from cache if available
const output = await pulumiGetStackOutputService.execute(app);

// Force refresh - skips cache and updates it
const output = await pulumiGetStackOutputService.execute(app, { skipCache: true });

Cache is automatically updated after each deployment and properly isolated by environment/region/variant context.

Original prompt

let's add caching in packages/project/src/services/PulumiGetStackOutputService/PulumiGetStackOutputService.ts
we want the cache to be stored in .webiny/caches/stack-output.
cache key must take env / region / variant into consideration.
in PulumiGetStackOutputService.Params, we need to add skipCache option, which will skip cache and update the cache in .webiny folder again.
finally, this option must be used when the deploy is done in packages/project/src/features/DeployApp/DeployApp.ts. We ca add it between

    // Promise is returned so that the caller can await it if needed.
    await pulumiProcess;
    await output;

The user has attached the following files from their workspace:

• packages/project/src/features/DeployApp/DeployApp.ts

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