Merge #15946: Allow maintaining the blockfilterindex when using prune

84716b134e9afca2fba7731de4af1f22fa1b1518 Add "index/blockfilterindex -> validation -> index/blockfilterindex" to expected circular dependencies (Jonas Schnelli)
ab3a0a2fb915d8b8384c30a8b38b4b5cc35236fd Add functional test for blockfilterindex in prune-mode (Jonas Schnelli)
c286a22f7b63a8bd336d5d7606c339053ee0054b Add debug startup parameter -fastprune for more effective pruning tests (Jonas Schnelli)
5e112269c311a559bfded814d3c3c438349a1986 Avoid pruning below the blockfilterindex sync height (Jonas Schnelli)
00d57ff76854938ead800767fb673a8af46eac8e Avoid accessing nullpointer in BaseIndex::GetSummary() (Jonas Schnelli)
6abe9f5b11cd4a5ecb6caca8443fe2950a417842 Allow blockfilter in conjunction with prune (Jonas Schnelli)

Pull request description:

  Maintaining the blockfilterindexes in prune mode is possible and may lead to efficient p2p based rescans of wallets (restore backups, import/sweep keys) beyond the prune height (rescans not part of that PR).

  This PR allows running the blockfilterindex(es) in conjunction with pruning.
  * Bitcoind/Qt will shutdown during startup when missing block data has been detected ([re]enable `-blockfilterindex` when we already have pruned)
  * manual block pruning is disabled during blockfilterindex sync
  * auto-pruning is delayed during blockfilterindex sync

  ToDos:
  * [x] Functional tests

ACKs for top commit:
  fjahr:
    Code review ACK 84716b1
  ryanofsky:
    Code review ACK 84716b134e9afca2fba7731de4af1f22fa1b1518. Only changes since last review were suggested new FindFilesToPrune argument and test.
  benthecarman:
    tACK 84716b134e9afca2fba7731de4af1f22fa1b1518

Tree-SHA512: 91d832c6c562c463f7ec7655c08956385413a99a896640b9737bda0183607fac530435d03d87c3c0e70c61ccdfe73fe8f3639bc7d26d33ca7e60925ebb97d77a

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