[Rules] Add response header accepts an expression

[pedrosousa]

Summary

Addresses PCX-17592.

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Enhanced response header modification capabilities by introducing the ability to add headers based on expressions.

• Added support for adding HTTP response headers according to expressions.
• Updated documentation to clarify operations for modifying response headers.
• Improved instructions for creating response header transform rules.

Modified Files

• src/content/docs/rules/transform/response-header-modification/create-dashboard.mdx
• src/content/docs/rules/transform/response-header-modification/index.mdx
• src/content/docs/rules/transform/response-header-modification/reference/parameters.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/rules/	@pedrosousa, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://91136cf8.preview.developers.cloudflare.com
Preview Branch URL: https://pedro-pcx-17592-rules-update-add-op.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/rules/transform/response-header-modification/reference/parameters/	https://pedro-pcx-17592-rules-update-add-op.preview.developers.cloudflare.com/rules/transform/response-header-modification/reference/parameters/
https://developers.cloudflare.com/rules/transform/response-header-modification/	https://pedro-pcx-17592-rules-update-add-op.preview.developers.cloudflare.com/rules/transform/response-header-modification/
https://developers.cloudflare.com/rules/transform/response-header-modification/create-dashboard/	https://pedro-pcx-17592-rules-update-add-op.preview.developers.cloudflare.com/rules/transform/response-header-modification/create-dashboard/