Retrieve bugs for certain products and exclude them from other models except `spam_bug`

[jpangas]

Fixes #2786

This PR includes the bugs from "Calendar", "Chat Core", "MailNews Core" and "Thunderbird" products. As requested in the issue, this PR excludes the bugs from these products from all other models and only makes them available in the spam_bug model.

Comments: This will exclude some of the bugs from PRODUCTS_TO_EXCLUDE which may have been retrieved from other areas such as labelled_bug_ids, commit_bug_ids, etc. I was guided by this comment from the issue.

[jpangas]

This change is the first step into training the spam_bug model on bugs from the newly included products.