Merge bitcoin/bitcoin#28721: multiprocess compatibility updates

3b70f7b6156cb110c47a6e482791cf337bb6ad6d doc: fix broken doc/design/multiprocess.md links after #24352 (Ryan Ofsky)
6d43aad742c7ea28303cf2799528188938e7ce32 span: Make Span template deduction guides work in SFINAE context (Ryan Ofsky)
8062c3bdb9dd3062597ed8299e99151b612d32b7 util: Add ArgsManager SetConfigFilePath method (Ryan Ofsky)
441d00c60f0a67889d23f8556190ff99dde488bc interfaces: Rename CalculateBumpFees methods to be compatible with capn'proto (Ryan Ofsky)
156f49d682ef025fb942c997a6c5475e18eef9cf interfaces: Change getUnspentOutput return type to avoid multiprocess segfault (Ryan Ofsky)
4978754c0058bbdfbcd492f25fa49ef211e11d6e interfaces: Add schedulerMockForward method so mockscheduler RPC can work across processes (Ryan Ofsky)
924327eaf3ada45a603e80aa4a3ab38a0f8c8673 interfaces: Fix const virtual method that breaks multiprocess support (Ryan Ofsky)
82a379eca8251c736b4de6e7a2516582641ce397 streams: Add SpanReader ignore method (Russell Yanofsky)

Pull request description:

  This is a collection of small changes to interfaces and code which were needed as part of multiprocess PR #10102, but have been moved here to make that PR smaller.

  All of these changes are refactoring changes which do not affect behavior of current code

  ---

  This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/issues/28722).

ACKs for top commit:
  achow101:
    ACK 3b70f7b6156cb110c47a6e482791cf337bb6ad6d
  naumenkogs:
    ACK 3b70f7b6156cb110c47a6e482791cf337bb6ad6d
  maflcko:
    re-ACK 3b70f7b6156cb110c47a6e482791cf337bb6ad6d  🎆

Tree-SHA512: 2368772b887056ad8a9f84c299cfde76ba45943770e3b5353130580900afa9611302195b899ced7b6e303b11f053ff204cae7c28ff4e12c55562fcc81119ba4c

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