Merge bitcoin/bitcoin#28741: refactor: Fix bugprone-string-constructor warning

fa56067a8f56701cbda95595592e74934af7d1cd refactor: Fix bugprone-string-constructor warning (MarcoFalke)

Pull request description:

  String literals in C++ have a trailing null character, so the current code is fine to rely on that implicitly. However,
  * the sqlite documentation explicitly mentions the null character
  * code readers may wonder if the code is intentional
  * clang-tidy warns about the code via `bugprone-string-constructor`

  Address the points by putting the null character into the code and enable the clang-tidy `bugprone-string-constructor` check.

ACKs for top commit:
  stickies-v:
    ACK fa56067a8f56701cbda95595592e74934af7d1cd

Tree-SHA512: da519184d792a885a8151ffc44c8da5781f5aaae12ef768a187cc6d9e542ca8952aebc2ec6c1a05f673f29a86ef44902ee96e7b491af7b4705ad38e14624882e

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