utils: Update test checking characters escaping in a SWHID URL

swh-model was updated to fix deserializing of origin qualifier in a QualifiedSWHID instance which breaks a test of the webapp.

Align test with changes in swh-model and improve it to check that a qualified SWHID containing special characters that must be escaped can be successfully resolved to a browse URL but also that the latter can be successfully browsed.

Depends on swh-model!348 (merged), CI will fail until it is merged and tagged.