[bitcoin/bitcoin] tests: Setup chain parameters (globalChainParams) when performing fuzzing initialization (#14010)

Setup chain parameters (`globalChainParams`) when performing fuzzing initialization.

This allows for fuzzing code which calls `Params()` directly or indirectly.

Previously such code would hit an assertion failure when fuzzing.
You can view, comment on, or merge this pull request online at:

https://github.com/bitcoin/bitcoin/pull/14010

— Commit Summary —

* tests: Setup chain parameters (globalChainParams) when performing fuzzing initialization

— File Changes —

M src/test/test_bitcoin_fuzzy.cpp (2)

— Patch Links —

https://github.com/bitcoin/bitcoin/pull/14010.patch
https://github.com/bitcoin/bitcoin/pull/14010.diff