Merge bitcoin/bitcoin#21733: build: Re-add command to install vcpkg

de17d245b7462784f9d36591b0f346aa6b2e9b8c Re-add command to install vcpkg (dplusplus1024)

Pull request description:

  `vcpkg integrate install` must be executed so that msbuild will automatically install external dependencies.

  It was removed in https://github.com/bitcoin/bitcoin/commit/712f95d3324d02310dd468e7bfd1e1b0df432e77

  It was originally added in https://github.com/bitcoin/bitcoin/commit/76445677586a4c2fa72606b662269a4390c2e71f

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ACKs for top commit:
  sipsorcery:
    ACK de17d245b7462784f9d36591b0f346aa6b2e9b8c.
  hebasto:
    ACK de17d245b7462784f9d36591b0f346aa6b2e9b8c, I use the same in #21551.

Tree-SHA512: b32428e450cf76297a0e78b5ffb0933ddcfcce010dbd6f5b87d434bf9c437258edb5b817161f6255d5d60523f79f8513a1fe3e92ba62e3fd3786ab042aaae849

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