No changes - Learner Search removal on hold

[Copilot]

Issue requested disabling the learner search at /learners and removing Elasticsearch infrastructure. However, per @pdpinch's comment, this is on hold—customer support is still using the feature and their needs must be understood first.

No code changes made. This PR documents the hold status.

Next Steps

• Clarify customer support requirements for learner search
• Determine if feature should be fixed or removed
• Reopen work when stakeholders take issue off hold

Original prompt

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This section details on the original issue you should resolve

<issue_title>Disable Learner Search</issue_title>
<issue_description>### Description/Context

The learner search, found at /learners, has been replaced by the Learner Search in the data platform. We can remove the feature, the code and the elastic search server in micromasters.

Plan/Design

• disable the user interface to learner search at /learners
• for staff only, we can give them a link to the Learner Search in the data platform
• turn off elastic search
• remove the code</issue_description>

Comments on the Issue (you are @copilot in this section)

@pdpinch Customer support noticed that learner search was broken and they've indicated that they are still using it. Let's put this on hold until we understand what their needs are.

• Fixes Disable Learner Search #5422

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