Account for upcoming change in WP 5.7 / script tag use

PR https://github.com/WordPress/WordPress-Coding-Standards/pull/1956 in WPCS refers to changes in WP Core which will remove the use of the `` HTML tag in PHP code.

Any existing sniff which looks at the content of inline HTML and takes the `<script>` tag into account will need to be reviewed to see if it can still detect what it is looking for with the "new" way of writing this type of code.

This PR to WP Core gives some good examples of the "new" way of writing this type of code and can be used to for code samples: https://github.com/WordPress/wordpress-develop/pull/498/files

This PR shows the new functionality which will be added to Core: https://github.com/WordPress/wordpress-develop/pull/591

Review the existing sniffs that inspect inline HTML for script tags, using the linked WPCS and WordPress Core PRs as the starting references and code examples. Check whether they still detect the relevant patterns after the WP 5.7 change; done means the affected sniffs handle the new style correctly.

Written by the indexing model from the issue text.