MLE-31424: Backport to 11.3 changing xdmp:is-forwarded to xdmp:request-forwarded

[vzhang-progress]

• Change xdmp:is-forwarded to xdmp:request-forwarded as the builtin name changed in xdmp
• Tests: Unit tests all passed

[Copilot]

Pull request overview

Updates mlcp’s reverse-proxy detection logic to use the renamed MarkLogic builtin xdmp:request-forwarded (replacing xdmp:is-forwarded) within the XQuery snippets embedded in ContentOutputFormat, aligning with MarkLogic 11.3’s builtin naming.

Changes:

• Switched the HTTP and XDBC forwarded-request detection queries from xdmp:is-forwarded to xdmp:request-forwarded.
• Kept the existing header-based fallback behavior when the function lookup fails.

Comments suppressed due to low confidence (1)

src/main/java/com/marklogic/mapreduce/ContentOutputFormat.java:138

• Same as HEADER_QUERY: XDBC_HEADER_QUERY no longer attempts xdmp:is-forwarded() when present. If xdmp:request-forwarded is unavailable on the target server, this changes behavior compared to earlier releases. Consider looking up both names before falling back to request-header checks.

        "let $f := fn:function-lookup(xs:QName('xdmp:request-forwarded'),0)\n" +
        "return if (exists($f)) then $f() " +
        "else (" +

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