Merged PR 3625: Excludes new dash users without id deal

# Description

This PR has 2 commits:
- The first one handles the removal from the computation any user that has not an id deal properly set. I just created a boolean field in int_core__user_host that identifies if the host has no id_deal. Then apply the new condition in the 2 main usages of New Dash info.
- The second one cleans New Dash KPIs. Since we do not have anymore users without deals, it means that the identification of the host/account is going to be exactly the same if done by id_user_host or id_deal. I hated having id_user_host in KPIs so I've removed it :)

Lastly, this should speed up massively the execution. Not because there's improvements on the code but rather the reduction of data.

# Checklist

- [X] The edited models and dependants run properly with production data.
- [X] The edited models are sufficiently documented.
- [X] The edited models contain PK tests, and I've ran and passed them.
- [X] I have checked for DRY opportunities with other models and docs.
- [X] I've picked the right materialization for the affected models.

# Other

- [ ] Check if a full-refresh is required after this PR is merged.

Related work items: #20809

models/intermediate/core/schema.yml

@@ -1850,6 +1850,11 @@ models:
         description: |
           Date of the last time the information of the Host was updated
           in our systems.
+      - name: is_missing_id_deal
+        data_type: boolean
+        description: |
+          Flag to identify if a user is missing the id_deal (true) or 
+          not (false).
       - name: is_user_in_new_dash
         data_type: boolean
         description: |