docs(write-your-first-test): change toml extension to jsonc

[kotkoroid]

Summary

The write-your-first-test page currently references TOML Wrangler configuration. This pull request addresses that issue by updating the content to reflect the growing preference for the JSONC format.

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PR Change Summary

Updated the configuration format in the write-your-first-test documentation to reflect the preference for JSONC over TOML.

• Changed configuration file reference from TOML to JSONC format
• Updated examples to use the new JSONC configuration path

Modified Files

• src/content/docs/workers/testing/vitest-integration/write-your-first-test.mdx

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[kodster28]

Thanks for the find / fix, @kotkoroid.

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