Use safe_format over format(ERB::Util.html_escape(...))

What does this MR do and why?

Uses the more concise safe_format over format(ERB::Util.html_escape(...)). Applies a change similar to !223287 (merged).

How to set up and validate locally

1. go to a project's integration page and select an integration with Issue URL field (for example, https://gitlab.com/<NAMESPACE>/<PROJECT_NAME>/-/settings/integrations/bugzilla/edit)
2. verify HTML is not changed as this is only a maintenance patch

before	after (no change)

MR acceptance checklist

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