chore(consume): retry logic for initial consume engine fcu (ethereum#1815)

* chore(consume): add exponential retry logic for initial fcu in consume engine.

* chore(docs): changelog.

Author: spencer-tb

CHANGELOG.md

@@ -45,6 +45,7 @@ Users can select any of the artifacts depending on their testing needs for their
 
 - 🔀 `consume` now automatically avoids GitHub API calls when using direct release URLs (better for CI environments), while release specifiers like `stable@latest` continue to use the API for version resolution ([#1788](https://github.com/ethereum/execution-spec-tests/pull/1788)).
 - 🔀 Refactor consume simulator architecture to use explicit pytest plugin structure with forward-looking architecture ([#1801](https://github.com/ethereum/execution-spec-tests/pull/1801)).
+- 🔀 Add exponential retry logic to initial fcu within consume engine ([#1815](https://github.com/ethereum/execution-spec-tests/pull/1815)).
 
 #### `execute`