brand processData: pass logo urls unchanged

[gordonwoodhull]

fixes #12643

When populating brand processedData with logo paths, we need to skip URLs.

Later processing does this already, as demonstrated by tests.

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[gordonwoodhull]

Hmm, a lot of errors in code we haven't changed recently, prob "collateral evolution" 😉

error: Uncaught (in promise) SyntaxError: Invalid flags supplied to RegExp constructor 'l'
const kNamedFileRegex = RegExp(kNamedFilePattern, "l");
                        ^
    at RegExp (<anonymous>)
    at file:///home/runner/work/quarto-cli/quarto-cli/src/project/types/website/util/discover-meta.ts:18:25
Error: Process completed with exit code 1.

[gordonwoodhull]

Closing this because GHA refuses to run the tests correctly.

Replaced by #13214 (which probably won't do any better).