Merge #16293: test: Make test cases separate functions

faf8318 test: Split fundrawtx test into subtests (MarcoFalke)
fa6fba3 test: Make local symbols in run_test members (MarcoFalke)

Pull request description:

  This prevents scope-leak of symbols that are supposed to be local to one test case.

Top commit has no ACKs.

Tree-SHA512: 9b2a4ca2cdd631ef915d2f7e6cd62375df9a0919448350aa6e5ae4aa8a8fe3ba53870f7a9a25a57736894b4e3a45e861018253ed2d57d9a64c2bb65fa270fad8

Author: MarcoFalke