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8a712b0b - Treat paths originating as PEP 508 URLs which contain expanded variables as relative (#18680)

Treat paths originating as PEP 508 URLs which contain expanded variables as relative (#18680) ## Summary Fix a regression caused by and reported in #18176. PEP 508 doesn't actually permit variables to be specified within these URLs but we support this probably due to needing to handle it for requirements files. To avoid a breaking change in a patch release, any `VerbatimUrl` that was parsed as a PEP 508 URL that contained variables that were expanded is always treated as relative. The determination of if a `VerbatimUrl` qualifies has to be done at creation time because otherwise we would incorrectly treat a non PEP 508 URL which contained something which looks like a variable reference as a relative path in cases where this wouldn't be correct. ## Test Plan Existing test coverage covers the non-regressed case, added a test for the regressed case.