test: allow query suffix in related media URL e2e assertions (#89872)
## Summary
- apply the same deploy query-suffix tolerance (`(?:\?.*)?`) to related
e2e background-image URL assertions
- update SCSS URL tests (`url-global-partial`,
`url-global-asset-prefix-1`, `url-global-asset-prefix-2`) and
`url-imports` CSS background-image assertion
## Context
- follow-up to #89856, which applied this fix to `url-global`
## Verification
- regex sanity checks with and without query suffixes passed
- attempted local `testonly` run for `url-imports`, but local
Turbopack+urlImports limitations caused unrelated failures