Merge bitcoin/bitcoin#26489: test: Split overly large util_tests.cpp file

fa4ec1b test: Split overly large util_tests.cpp file (MacroFake)

Pull request description:

  The file has ~3kLOC and is slow to compile.

  Fix both issues by splitting it. (On my machine the compilation goes from 25 seconds previously to 17+10 seconds for the two smaller files)

  To review, `--color-moved=dimmed-zebra` can be used.

ACKs for top commit:
  RandyMcMillan:
    ACK fa4ec1b for:
  shaavan:
    ACK fa4ec1b
  aureleoules:
    ACK fa4ec1b

Tree-SHA512: 4719439c7ee0c6c06b6f6ccf07b3a037c0cae58b1bd6e6e929ebfeab8403be3d1905581669ed733bff0cbf4e385c27ae58d519ce031e145e6889bd5bce1c1d03

Author: MacroFake

src/Makefile.test.include

@@ -66,6 +66,7 @@ BITCOIN_TESTS =\
   test/addrman_tests.cpp \
   test/allocator_tests.cpp \
   test/amount_tests.cpp \
+  test/argsman_tests.cpp \
   test/arith_uint256_tests.cpp \
   test/banman_tests.cpp \
   test/base32_tests.cpp \