test: update test implementation to work well with typescript 6

[joker23]

This PR will update the way that tests import modules. This is to make the syntax of this module compatible with typescript 6.

Specifically the issue that the current syntax runs into is detailed in https://devblogs.microsoft.com/typescript/announcing-typescript-6-0/#deprecated:---esmoduleinterop-false-and---allowsyntheticdefaultimports-false

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Note

Low Risk
Test and compiler-option changes only; no production runtime or public API changes.

Overview
Prepares the monorepo for TypeScript 6 by turning on esModuleInterop: true in tsconfig.json for edge SDK packages (akamai-base, akamai-edgekv, cloudflare, fastly, shopify-oxygen, vercel), shared packages (akamai-edgeworker-sdk, sdk-client, sdk-server-edge), and related configs.

Tests that load fixture JSON are updated from namespace imports (import * as testData from '...json') to default imports (import testData from '...json'), matching how resolveJsonModule behaves with interop enabled. The same pattern is applied across edge integration tests and many sdk-client LDClientImpl tests that use mockResponse.json.

packages/sdk/fastly/jest.config.json is reformatted only (no behavior change).

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[github-actions]

@launchdarkly/js-sdk-common size report
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[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
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Uncompressed size: 114243 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
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Uncompressed size: 831422 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 38739 bytes
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Uncompressed size: 212244 bytes

[joker23]

@cursor review

[cursor]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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