Add warning for Service Worker deprecation

[harshil1712]

Summary

Updates a warning for Service Worker examples.

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Updated documentation to include warnings regarding the deprecation of Service Workers and recommended migration to Module Workers.

• Added caution notes about Service Workers being deprecated in multiple documentation files.
• Recommended using Module Workers instead of Service Workers for new features.
• Updated examples to reflect the changes in Service Worker usage.

Modified Files

• src/content/docs/learning-paths/mtls/mtls-workers/index.mdx
• src/content/docs/workers/configuration/sites/start-from-existing.mdx
• src/content/docs/workers/examples/cache-using-fetch.mdx
• src/content/docs/workers/observability/errors.mdx
• src/content/docs/workers/observability/logs/workers-logs.mdx
• src/content/docs/workers/reference/migrate-to-module-workers.mdx
• src/content/docs/workers/runtime-apis/fetch.mdx
• src/content/docs/workers/runtime-apis/streams/index.mdx
• src/content/docs/workers/wrangler/migration/v1-to-v2/wrangler-legacy/configuration.mdx

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[github-actions]

Preview URL: https://75d3c337.preview.developers.cloudflare.com
Preview Branch URL: https://service-worker-callout.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/learning-paths/mtls/mtls-workers/	https://service-worker-callout.preview.developers.cloudflare.com/learning-paths/mtls/mtls-workers/
https://developers.cloudflare.com/workers/observability/errors/	https://service-worker-callout.preview.developers.cloudflare.com/workers/observability/errors/
https://developers.cloudflare.com/workers/runtime-apis/streams/	https://service-worker-callout.preview.developers.cloudflare.com/workers/runtime-apis/streams/
https://developers.cloudflare.com/workers/configuration/sites/start-from-existing/	https://service-worker-callout.preview.developers.cloudflare.com/workers/configuration/sites/start-from-existing/
https://developers.cloudflare.com/workers/examples/cache-using-fetch/	https://service-worker-callout.preview.developers.cloudflare.com/workers/examples/cache-using-fetch/
https://developers.cloudflare.com/workers/observability/logs/workers-logs/	https://service-worker-callout.preview.developers.cloudflare.com/workers/observability/logs/workers-logs/
https://developers.cloudflare.com/workers/reference/migrate-to-module-workers/	https://service-worker-callout.preview.developers.cloudflare.com/workers/reference/migrate-to-module-workers/
https://developers.cloudflare.com/workers/runtime-apis/fetch/	https://service-worker-callout.preview.developers.cloudflare.com/workers/runtime-apis/fetch/
https://developers.cloudflare.com/workers/wrangler/migration/v1-to-v2/wrangler-legacy/configuration/	https://service-worker-callout.preview.developers.cloudflare.com/workers/wrangler/migration/v1-to-v2/wrangler-legacy/configuration/