Add conditional for CPT archives and CPT term archives

[mikeyarce]

Description

When you register a custom post type with a taxonomy, the archive pages don't have the right metadata, they pick up the metadata from the first item in the loop instead of the main archive page.

What I'm trying here is adding the is_post_type_archive() conditional and switching to getting the queried object instead of just calling get_the_category() as that doesn't work in all cases.

Edit: I found that there's another case that I wanted to target: custom post type taxonomy archives. I've addressed that and added unit tests for that as well.

Fixes #327

Motivation and Context

Fixing this for custom post type archives

How Has This Been Tested?

1. On your test site, make sure you have a CPT with a category
2. Also make sure you have a regular post type with a category
3. Check this PR out to your test site
4. Go to the Archive pages for both the CPT and the regular post category
5. Check to see if the right metadata is present for them both.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Question: Should we also check if the post type is currently added to the Parse.ly options?

[GaryJones]

This could do with some tests.

[GaryJones]

Fix the condition as you suggested, tweak the test method name as I've now added, and then this is good to land. Thank you Mikey 👍🏻

[GaryJones]

[pauarge]

I have merged develop into this branch. I kept the changes, but I had to split the tests into two separate files to follow the pattern that we have adopted since we did this PR.

[pauarge]

LGTM

[GaryJones]

Minor tweaks.