configparse: do not delete passpoint configuration file

Fix merge conflict into nyc-mr1-security release branches
It is the caller's responsibility for deleting configuration files.

This avoids the ConfigBuilder from deleting arbitrary files
(specified by URI) pass-in by the callers.

Bug: 33178389
Test: Verify Passpoint Configuration installation works using Shamu
Change-Id: I54803dc711ede98a1ec1259077522032c543dca1