Merge bitcoin/bitcoin#22805: refactor: use CWallet const shared pointers in dump{privkey,wallet}

d150fe3ad5ce181511f2d2fd035a10530eaa4203 refactor: use `CWallet` const shared pointers in dump{privkey,wallet} RPCs (Sebastian Falbesoner)
ec2792d1dc3404d749a43556eeb4b63780ee6d94 refactor: use const `LegacyScriptPubKeyMan` references in dump{privkey,wallet} RPCs (Sebastian Falbesoner)
29905c092f15bbbc4d4964c2f99dcf12fefd4111 refactor: avoid multiple key->metadata lookups in dumpwallet RPC (Sebastian Falbesoner)

Pull request description:

  ~~This PR is based on #22787 ("refactor: actual immutable pointing"), which should be reviewed first.~~ (merged by now)

  It aims to make the CWallet shared pointers actually immutable also for the `dumpprivkey` and `dumpwallet` RPC methods. For doing that, some more preparations are needed; we need a const-counterpart to the helper `EnsureLegacyScriptPubKeyMan` that accepts a const CWallet pointer and accordingly also returns a const `LegacyScriptPubKeyMan` instance. The metadata lookup in `dumpwallet` is changed to not need a mutable `ScriptPubKeyMan` instance by avoiding using the `operator[]` in its mapKeyMetadata map, which also avoids repeated lookups.

ACKs for top commit:
  laanwj:
    Code review ACK d150fe3ad5ce181511f2d2fd035a10530eaa4203

Tree-SHA512: 90ac05e21f40c6d0ebb479a71c545da2fd89940b9ca3409d9f932abc983bf8830d34c45086e68880d0d1e994846fbefee7534eec142ff4268e0fa28a1a411d36

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