Adds pagination to model index

What does this MR do and why?

Adds pagination to model index

Limit was harcdoded to 100 entries, now it does proper pagination. The goal of this MR is to just add pagination, not to improve the UX, which is part of #385061 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Enable the feature flag and create a bunch of models on rails console

   Feature.enable("model_registry")
   p = Project.find_by(id: 19) # or whatever project you want to use for testing
   30.times { |n| Ml::FindOrCreateModelService.new(p, "model_#{n}").execute }

2. Navigate to <my_project>/-/ml/models. Wihtout the change, all 30 models will be displayed. With the change, you will be able to see the pagination

Queries

SELECT
    "ml_models".*
FROM
    "ml_models"
WHERE
    "ml_models"."project_id" = 19
    AND ("ml_models"."id" > 1)
ORDER BY
    "ml_models"."id" ASC
LIMIT 21

https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/22844/commands/73695

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