Fix verifiable ad conversion idiosyncrasies

[iambrianfung]

Misc edge cases that can break the VAC feature.

1. mismatched conversion URLs

   1. the conversion URLs in the catalog & resource file must match.
      • ex. for conversion URL https://brave.com/careers/
        • https://brave.com/careers/* + https://brave.com/careers* will fail to fetch the conversion id
        • https://brave.com/careers/* in both or https://brave.com/careers* in both will do so successfully.

2. do not use single-quotes for HTML attributes in the regex.

   1. Brave browser re-interprets single-quotes in HTML as double-quotes in the DOM.
      click to expand

      
      
   2. using single-quotes in the regex for the VAC serializer will fail to capture the conversion id.

[tmancey]

@iambrianfung as discussed in DM #1 will be resolved by transitioning conversions from ads resources to the catalog. Lets raise a new issue and only resolve #2 for this ticket.

[tmancey]

With regards to #2 are we saying we should try replace ` with " before trying the match?

[tmancey]

@tackley discussed with @iambrianfung and we will raise issues to normalize regex, i.e. replace single quotes with double quotes in the resource generator for #2.

#1 will be resolved when transitioning conversions from component updater resources to the catalog.