Merge #14252: build: Run functional tests and benchmarks under the undefined behaviour sanitizer (UBSan)

9f49db7335 Enable functional tests in UBSAN job. Enable -fsanitize=integer (part of UBSAN). Merge UBSAN Travis job with no depends. (practicalswift)

Pull request description:

  Run functional tests and benchmarks under the undefined behaviour sanitizer (UBSan).

  This will make Travis automatically detect issues such as:
  * #14242: Avoid triggering undefined behaviour (`std::memset(nullptr, 0, 0)`) if an invalid string is passed to `DecodeSecret(...)`
  * #14239: Avoid dividing by zero (undefined behaviour) in `EstimateMedianVal` (policy)/`ConnectTip` (validation)/`CreateTransaction` (wallet)
  * #13546: wallet: Avoid potential use of uninitialized value `bnb_used` in `CWallet::CreateTransaction(...)`

  Addresses issue #14059.

Tree-SHA512: 285e1542b36c582516c47938ce8d999fd89ba6c867bc0976e7306e7c949b8b84ffbfa43dbc679dd97ae639b086092e7d799d8e1c903c66a37d529ce61d5c64b4

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