Merge #21121: [test] Small unit test improvements, including helper to make mempool transaction

1363b6c27dbd2614fd555d148ea624ed8b95f14e [doc / util] Use comments to clarify time unit for int64_t type. (Amiti Uttarwar)
47a7a1687d276bfa8769dee4bb78e8725f67a50e [util] Introduce a SetMockTime that takes chrono time (Amiti Uttarwar)
df6a5fc1dff3b1b7c2f2b67aad1ff17cac99f7b6 [util] Change GetMockTime to return chrono type instead of int (Amiti Uttarwar)
a2d908e1daa1d1be74568bd7d1d04b724da7d79c [test] Throw error instead of segfaulting in failure scenario (Amiti Uttarwar)
9a3bbe8fc57d88919acd4eadbc96124711f17ec2 [test] Introduce a unit test helper to create a valid mempool transaction. (Amiti Uttarwar)

Pull request description:

  Some miscellaneous improvements that came up when working on #21061
  - The first commit is a helper to make valid mempool transactions & submit via ATMP. Introducing in this PR, using in #21061.
  - The second commit is a small improvement in `miner_tests.cpp` that uses `BOOST_REQUIRE_EQUAL` to properly terminate the program instead of segfaulting in the failure scenario where the blocks do not include the expected number of transactions.
  - The third commit changes the function signature of `GetMockTime()` to return a chrono type.
  - The fourth & fifth commit overload `SetMockTime` to also accept chrono type, and adds documentation to indicate that the `int64_t` function signature is deprecated.

ACKs for top commit:
  vasild:
    ACK 1363b6c27dbd2614fd555d148ea624ed8b95f14e

Tree-SHA512: c72574d73668ea04ee4c33858f8de68b368780f445e05afb569aaf8564093f8112259b3afe93cf6dc2ee12a1ab5af1130ac73c16416132c1ba2851c054a67d78

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