Add explicit path for html_escape methods in safe_format_helper.rb

What does this MR do and why?

It add explicit module/class for html_escape and html_escape_once methods used in safe_format_helper.rb.

Without using the ERB::Util using safe_format method in areas not related to views or view-components would fail since ERB::Util is not available (e.g. !130862 (merged)).

Original thread on Slack. Thanks @jessieay for the help!

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