fix: set correct post context for author hooks #4011

[preda-bogdan]

Summary

The Feedzy uses the global $post inside the hook that changes the Author.
In order to allow hooks that rely on the global to work properly, I changed the context while rendering the template part
with the post that is dynamically passed.
Also, a cleanup was added at the end to preserve the original global for further code execution.

Will affect the visual aspect of the product

NO

Screenshots

Import Feed (Pic 1)

Map Content (Pic 2)

Map Content (Pic 3)

Import Posts (Pic 4)

Featured Posts Sticky (Pic 5)

Correct Sticky Frontend (Pic 6)

Test instructions

1. Create a fresh Neve instance
2. Install Feedzy and Feedzy PRO
3. Go to Feedzy > Import Posts, and create a New Import
4. Inside Source Configuration add https://www.techzone.ro/rss-stiri-hardware as a source, or any other RSS feed. (see Pic 1)
5. Under Map Content for the General tab set the options as in Pic 2
6. Under Map Content > Advanced Options, toggle the save options for the Post Author (see Pic 3)
7. Save the import, and select Run Now on the Import Posts list (see Pic 4)
8. Check that posts are imported with the author from the source RSS
9. Set one of the posts as Sticky
10. Enable inside the Customizer, under Layout > Blog Archive the Featured Post featured and set it to Sticky (see Pic 5)
11. Check the front-end
12. Create a new Post and set it to sticky as well, check that the author is correct for each sticky post. (see Pic 6)

Video with the bug can be found here for comparison: https://vertis.d.pr/v/uJ03Oa

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes #4011.

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[irinelenache]

@preda-bogdan Tested and the issue is fixed, didn't find any other problem 🚀

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