docs: surface Redpanda Connect pipelines for operator users (DOC-2275)

[JakeSCahill]

DRAFT: hold until the Pipeline CRD ships in a released operator and redpanda-data/rp-connect-docs#457 is published. Target slipped: now expected in 26.3, not 26.2.

Operator users currently have no way to discover the new Pipeline resource from the Streaming docs: the Manage > Kubernetes nav lists Manage Topics and (community-supported) Manage Kafka Connect, but not the first-class Connect option. This PR adds three discovery surfaces:

1. New page manage:kubernetes/k-connect-pipelines.adoc (nav: "Redpanda Connect Pipelines", next to Manage Kafka Connect): short concept page covering what the Pipeline resource is, when to choose it over Kafka Connect, and routing to the full guide in the Connect docs (xref:connect:install:kubernetes-operator.adoc[]).
2. CRD index row: Pipeline added to reference:k-crd-index.adoc with source-file link and cross-link to the guide.
3. TIP on Manage Kafka Connect: points the highest-intent audience (people looking for connectors on Kubernetes) at the Pipeline resource.

Build note

Antora reports two expected broken-xref warnings for connect:install:kubernetes-operator.adoc because that page lives in the unmerged rp-connect-docs#457. They resolve when that PR merges.

Before un-drafting (GA batch, with rp-connect-docs#457)

• rp-connect-docs#457 published (fixes the xref warnings)
• Fill in the minimum operator version on the new page (TODO marker)
• Add the operator what's-new entry (deliberately not in this PR: the v26.2.x release-notes section is in unmerged Add Stretch Cluster deployment guide for Kubernetes (26.2) #1681 and would conflict)

Part of DOC-2275; eng feature is redpanda-operator#1677.

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[JakeSCahill]

Update: the Redpanda Connect operator support (Pipeline CRD, redpanda-operator#1677) is expected to slip past 26.2, most likely to 26.3. This PR stays in draft until the CRD ships in a released operator. Do not merge for the 26.2 GA on July 28.