docs(js): use supportedCategories for crons, MCP, and queues/caches pages

[mydea]

DESCRIBE YOUR PR

Stacked PR. Part of the JavaScript guide-categories series (#19492 → #19506). Depends on #19504; review/merge bottom-up.

Replace the enumerated server-framework supported lists on crons/*, mcp-monitoring, and the queues/caches instrumentation pages with supportedCategories: [server].

• These already listed all edge runtimes; the category form additionally covers guides stale-omitted from the manual lists.
• MCP monitoring's wrapMcpServerWithSentry lives in @sentry/core and is runtime-agnostic, so [server] is accurate.

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[sentry]

Bug: Using supportedCategories: [server] hides documentation from platforms like AWS Lambda because their configs lack a categories field, causing the isSupported check to fail.
_{Severity: HIGH}

Suggested Fix

To fix this, add the categories: [server] property to the config.yml files for all relevant serverless platforms (e.g., aws-lambda, azure-functions, gcp-functions). Alternatively, revert the front matter filtering on the affected pages to use the previous explicit supported list, or modify the isSupported function to handle missing categories.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: docs/platforms/javascript/common/crons/troubleshooting.mdx#L6-L7

Potential issue: The change from an explicit `supported` list to `supportedCategories:
[server]` in the front matter of documentation pages introduces a bug. The `isSupported`
function in `frontmatter.ts` now checks if a platform's `categories` array includes
`'server'`. However, serverless platforms like `aws-lambda`, `azure-functions`, and
`gcp-functions` do not have a `categories` field defined in their `config.yml`. As a
result, the check fails, and these platforms are incorrectly excluded from seeing
relevant documentation pages, such as the crons documentation, despite being listed in
`<PlatformSection>` components on the page.

Also affects:

• docs/platforms/javascript/common/crons/index.mdx:7~8

_{Did we get this right? 👍 / 👎 to inform future reviews.}