[28.x] Backports #32299

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

   Backports:

   • #32070
   • #32187
   • #32286
   • #32336
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. fanquake added this to the milestone 28.2 on Apr 17, 2025
6. 
   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.

7. DrahtBot added the label Backport on Apr 17, 2025
8. DrahtBot added the label CI failed on Apr 17, 2025
9. test: Add imports for util bpf_cflags

   This is required for the next commit.
   
   Github-Pull: #32336
   Rebased-From: fa0c1baaf89805182de56d6a2e8eed2265a94b40

   3df2624ee9
10. fanquake force-pushed on Apr 24, 2025
11. scripted-diff: Use bpf_cflags

    -BEGIN VERIFY SCRIPT-
    
     ren() { sed --regexp-extended -i "s/$1/$2/g" $( git grep --extended-regexp -l "$1" ) ; }
    
     ren 'cflags=\["-Wno-error=implicit-function-declaration"\]' 'cflags=bpf_cflags()'
    
    -END VERIFY SCRIPT-
    
    Github-Pull: #32336
    Rebased-From: facb9b327b9da39ce1e09ed56199be9efb19b5b8

    2ccdfa424c
12. doc: update release notes for 28.x a325ca3465
13. fanquake force-pushed on Apr 24, 2025

Contributors
fanquake DrahtBot

Labels
Backport CI failed

Milestone
28.2