Unwrap payload bid (#14035)

* engine GetPayload returns entire response

* deprecate PayloadValueTo(Gwei|Wei)

* return entire bid from builder getter

* get bid value from api bid (not ExecutionData)

* plumb bid and bundle through BuildBlockParallel

* rm ValueInGwei

* removing wei/gwei fields from the payload wrappers

* commentary around the little-endian situation

* finish the job in BuildBlockParallel

* light self-review cleanup

* fix spectest mock

* restore engine timeout

* lint fixes

* de-duplicate imports

* remove errant comment

* James feedback

---------

Co-authored-by: Kasey Kirkham <kasey@users.noreply.github.com>

math/BUILD.bazel

@@ -14,7 +14,6 @@ go_test(
     srcs = ["math_helper_test.go"],
     deps = [
         ":go_default_library",
-        "//consensus-types/primitives:go_default_library",
         "//testing/require:go_default_library",
     ],
 )