Bug 1824361 - [devtools] Only create missing inline script source in...

Bug 1824361 - [devtools] Only create missing inline script source in `_resurrectSource`. r=devtools-reviewers,jdescottes.

We want to create sources for inline script that were GCed, but we ended up
re-creating sources for _all_ the sources of HTML file where at least one inline
script was GCed, which could lead to duplicated source actors.

Differential Revision: https://phabricator.services.mozilla.com/D173524