Improvement: Added Rank Math compatibility.

[AbhijitNage123]

Description

• Added Improvement mention here
• Discuss on slack here

Screenshots

• Post is unlisted and Rank math is activated ( Master ) - https://share.getcloudapp.com/JruGrbLd
• Post is unlisted and Rank math is activated ( rank-math-compatibility ) - https://share.getcloudapp.com/wbuYE00E

Types of changes

• Bug fix (non-breaking change which fixes an issue)

How has this been tested?

• Install rankmath and unlist posts. unlist a post using our plugin.
• Visit post/page, Search for robots tag and check noindex is added or not.
• Switch to the above branch, refresh the post/page and search robots tag again and check noindex is added or not.

Checklist:

• My code is tested
• I've included any necessary tests
• I've added proper labels to this pull request

[codeclimate]

Code Climate has analyzed commit 7559a04 and detected 0 issues on this pull request.

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[Nikschavan]

@AbhijitNage123 - Can you include some screenshots of your testing this PR?

[AbhijitNage123]

@AbhijitNage123 - Can you include some screenshots of your testing this PR?

@Nikschavan Added in description Screenshot section.