Business logic to create an Ml::ModelVersion

What does this MR do and why?

Business logic to create an Ml::ModelVersion. This will be called from https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/services/packages/ml_model/create_package_file_service.rb#L14-14, but this MR is already too large.

The next work can be found in the following MRs:

1. !126686 (merged)
2. !127011 (merged)
3. !127130 (merged)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Database

Ml::Experiment

• find_or_create

SELECT
    "ml_experiments".*
FROM
    "ml_experiments"
WHERE
    "ml_experiments"."project_id" = 1
    AND "ml_experiments"."name" = 'abc'

https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/20398/commands/66611

Ml::Model

• find_or_create

SELECT
    "ml_models".*
FROM
    "ml_models"
WHERE
    "ml_models"."project_id" = 1
    AND "ml_models"."name" = 'abcd'
LIMIT 1

https://postgres.ai/console/gitlab/gitlab-production-tunnel-pg12/sessions/20398/commands/66612

Ml::ModelVersion

• find_or_create

SELECT
    "ml_model_versions".*
FROM
    "ml_model_versions"
WHERE
    "ml_model_versions"."project_id" = 1
    AND "ml_model_versions"."model_id" = 2
    AND "ml_model_versions"."version" = '12345'

table is not available on production to run queries, local output of EXPLAIN ANALYZE:

Index Scan using index_ml_model_versions_on_project_id_and_name_and_version on ml_model_versions  (cost=0.15..2.19 rows=1 width=112) (actual time=0.007..0.008 rows=0 loops=1)
  Index Cond: ((project_id = 1) AND (version = '12345'::text))
  Filter: (model_id = 2)

• I have evaluated the MR acceptance checklist for this MR.

Related to #410130 (closed)