DEV: skip flakey spec (#955)

This spec fails inconsistently with:

-fragment-n14
       +You are a helpful Discourse assistant.
       +You _understand_ and **generate** Discourse Markdown.
       +You live in a Discourse Forum Message.
       +
       +You live in the forum with the URL: http://test.localhost
       +The title of your site: test site title
       +The description is: test site description
       +The participants in this conversation are: joe, jane
       +The date now is: 2024-11-25 20:23:02 UTC, much has changed since you were trained.
       +
       +You were trained on OLD data, lean on search to get up to date information about this forum
       +When searching try to SIMPLIFY search terms
       +Discourse search joins all terms with AND. Reduce and simplify terms to find more results.<guidance>
       +The following texts will give you additional guidance for your response.
       +We included them because we believe they are relevant to this conversation topic.
       +
       +Texts:
       +
       +fragment-n10
       +fragment-n9
       +fragment-n8
       +fragment-n7
       +fragment-n6
       +fragment-n5
       +fragment-n4
       +fragment-n3
       +fragment-n2
       +fragment-n1
       +</guidance>

spec/lib/modules/ai_bot/personas/persona_spec.rb

@@ -444,6 +444,7 @@ RSpec.describe DiscourseAi::AiBot::Personas::Persona do
         end
 
         it "uses the re-ranker to reorder the fragments and pick the top 10 candidates" do
+          skip "This test is flaky needs to be investigated ordering does not come back as expected"
           expected_reranked = (0..14).to_a.reverse.map { |idx| { index: idx } }
 
           WebMock.stub_request(:post, "https://test.reranker.com/rerank").to_return(