Add REVIEW templates and remove old files

[acocac]

Summary

The PR aims to add template for REVIEW, remove old templates and add more instructions to EiC.

List of changes proposed in this PR (pull-request)

• Add REVIEW template in issues.
• Remove old markdown template files of PREVIEW and REVIEW
• Add further instructions steps for EiC

What should a reviewer concentrate their feedback on?

• Everything looks ok?

Acknowledging contributors

• All contributors to this pull request are already named in the table of contributors in the README file.
• The following people should be added to the table of contributors in the README file:

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