[DO NOT MERGE] Test support warning (re. assistance-only support and EOL) future states

[mikeCRL]

A test, following on https://github.com/cockroachdb/docs/pull/18611

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Files changed:

• src/current/_includes/sidebar-data-v23.1.json
• src/current/_includes/unsupported-version.md
• src/current/_includes/v23.1/sidebar-data/latest-releases.json
• src/current/_layouts/page.html

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[mikeCRL]

@mdlinville When I manually set today to 2025-11-14, the warnings on these pages look good:

• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/releases/v23.1
• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/releases/v23.2
• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/releases/v24.1

But shouldn't a warning also appear at the top of every doc page in 23.1 and 23.2? Nothing's showing up here:

• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/v23.1/authentication
• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/v23.2/authentication

Am I missing something, or is there a bug?

Note: The reason I continued to set a variable actual_today was to troubleshoot an earlier issue with my code; the idea was to add something like

Actually today: {{ actual_today }}
Future: {{ today }}

to validate the assignment of each. But I didn't need to do that, because the latest today code here seems to be working now.

[mdlinville]

@mdlinville When I manually set today to 2025-11-14, the warnings on these pages look good:

• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/releases/v23.1
• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/releases/v23.2
• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/releases/v24.1

But shouldn't a warning also appear at the top of every doc page in 23.1 and 23.2? Nothing's showing up here:

• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/v23.1/authentication
• https://deploy-preview-18615--cockroachdb-docs.netlify.app/docs/v23.2/authentication

Am I missing something, or is there a bug?

Note: The reason I continued to set a variable actual_today was to troubleshoot an earlier issue with my code; the idea was to add something like

Actually today: {{ actual_today }}
Future: {{ today }}

to validate the assignment of each. But I didn't need to do that, because the latest today code here seems to be working now.

Can you rerun the test and instead of changing today, change the dates in versions.csv such that a given version looks to be EOL, or LTS maintenance, or whatever?

[mdlinville]

I think this is ready to test again. When we are satisfied, we should decouple the logic changes and put them in another PR.