Merge bitcoin/bitcoin#27302: init: Error if ignored bitcoin.conf file is found

eefe56967b4eb4b5144325cde4f40fc1cbde3e65 bugfix: Fix incorrect debug.log config file path (Ryan Ofsky)
3746f00be1b732a04976fc70cbb0661f97bbbd99 init: Error if ignored bitcoin.conf file is found (Ryan Ofsky)
398c3719b02197ad92fded20f6ff83b364747297 lint: Fix lint-format-strings false positives when format specifiers have argument positions (Ryan Ofsky)

Pull request description:

  Show an error on startup if a bitcoin datadir that is being used contains a `bitcoin.conf` file that is ignored. There are two cases where this could happen:

  - One case reported in [#27246 (comment)](https://github.com/bitcoin/bitcoin/issues/27246#issuecomment-1470006043) happens when a `bitcoin.conf` file in the default datadir (e.g. `$HOME/.bitcoin/bitcoin.conf`) has a `datadir=/path` line that sets different datadir containing a second `bitcoin.conf` file. Currently the second `bitcoin.conf` file is ignored with no warning.

  - Another way this could happen is if a `-conf=` command line argument points to a configuration file with a `datadir=/path` line and that path contains a `bitcoin.conf` file, which is currently ignored.

  This change only adds an error message and doesn't change anything about way settings are applied. It also doesn't trigger errors if there are redundant `-datadir` or `-conf` settings pointing at the same configuration file, only if they are pointing at different files and one file is being ignored.

ACKs for top commit:
  pinheadmz:
    re-ACK eefe56967b4eb4b5144325cde4f40fc1cbde3e65
  willcl-ark:
    re-ACK eefe56967b
  TheCharlatan:
    ACK eefe56967b4eb4b5144325cde4f40fc1cbde3e65

Tree-SHA512: 939a98a4b271b5263d64a2df3054c56fcde94784edf6f010d78693a371c38aa03138ae9cebb026b6164bbd898d8fd0845a61a454fd996e328fd7bcf51c580c2b

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