[28.x] Backports #32299

1. 
   fanquake commented at 2:27 pm on April 17, 2025: member

   Backports:

   • #32070
   • #32187
   • #32286
2. test: Handle empty string returned by CLI as None in RPC tests 9b15b20cb1
3. refactor: Remove spurious virtual from final ~CZMQNotificationInterface

   Github-Pull: #32187
   Rebased-From: fa69c42fdf0aeec0546e951bc6132ab630edb9d4

   2d6c14efba
4. build: use make < 3.82 syntax for define directive

   From the GNU make 3.82 release announcement:
   
   * The 'define' make directive now allows a variable assignment operator
     after the variable name, to allow for simple, conditional, or appending
     multi-line variable assignment.
   
   macOS ships with 3.81. This caused the multiprocess config options
   to be ignored.
   
   Fixes #32068
   
   Co-authored-by: Ryan Ofsky <ryan@ofsky.org>
   
   Github-Pull: #32070
   Rebased-From: 9157d9e449870851ef455e077249ac46fc2df24c

   e65676216c
5. doc: update release notes for 28.x 1dbb93a037
6. fanquake added this to the milestone 28.2 on Apr 17, 2025
7. 
   DrahtBot commented at 2:27 pm on April 17, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32299.

   Reviews

   See the guideline for information on the review process. A summary of reviews will appear here.

8. DrahtBot added the label Backport on Apr 17, 2025
9. DrahtBot added the label CI failed on Apr 17, 2025

Contributors
fanquake DrahtBot

Labels
Backport CI failed

Milestone
28.2