Merge bitcoin/bitcoin#21935: Enable external signer support by default, reduce #ifdef

2f5bdcbc31a2eeb7c11226a9e51c56f02ac807dd gui: misc external signer fixes and translation hints (Sjors Provoost)
d672404466204444a1d9f2d3498de4448f53d2be refactor: make ExternalSigner NetworkArg() and m_chain private (Sjors Provoost)
4455145e266450397b45acd7286686966edd072b refactor: reduce #ifdef ENABLE_EXTERNAL_SIGNER usage (Sjors Provoost)
5be90c907eba0a38019c7d9826623d5d5f567c66 build: enable external signer by default (Sjors Provoost)
7d9453041b827bafbdfc1ac0b01c7b7e1ee2bd4f refactor: clean up external_signer.h includes (Sjors Provoost)
fc0eca31b33f87882e2aa329a3746d4e08af1985 fuzz: fix fuzz binary linking order (Sjors Provoost)

Pull request description:

  This follows the introduction of GUI support in https://github.com/bitcoin-core/gui/pull/4

  I don't think we should expect GUI users to self compile. This also enables external signer support by default for RPC users.

  In addition this PR reduces the number of `#ifdef ENABLE_EXTERNAL_SIGNER`, which also fixes #21919. When compiled with `--disable-external-signer` such wallets can't be created in RPC or GUI, but they can be loaded. Attempting any action that calls HWI will trigger an error.

  Side-note: this PR may or may not (currently) break CI for the GUI repository, as explained here: https://github.com/bitcoin-core/gui/pull/4#issuecomment-769859001

ACKs for top commit:
  achow101:
    ACK 2f5bdcbc31a2eeb7c11226a9e51c56f02ac807dd
  hebasto:
    re-ACK 2f5bdcbc31a2eeb7c11226a9e51c56f02ac807dd

Tree-SHA512: 1b71c5a8bea2be077ee9fa33a01130c957a0cf90951d4b7b04d3d0ef826bb77e474c3963abddfef2e2c1ea99d9c72cd2302d1eb9b5fcb7ba0bd2a625f006aa05

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