chore(functions/http): split samples into dirs

[ace-n]

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 5 region tags.

• functions/http/corsEnabledFunction/index.js:17, tag functions_http_cors
• functions/http/corsEnabledFunctionAuth/index.js:17, tag functions_http_cors_auth
• functions/http/httpContent/index.js:17, tag functions_http_content
• functions/http/parseXML/index.js:17, tag functions_http_xml
• functions/http/uploadFile/index.js:17, tag functions_http_form_data

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[muncus]

This PR is ready for review, as it now has routine testing with Github Actions.