Code review comment for ~hyask/autopkgtest-cloud:skia/always_dump_additional_params

Tested on staging: https://autopkgtest.staging.ubuntu.com/packages/mawk/mantic/amd64

Without all-proposed:
```
❯ curl https://autopkgtest.staging.ubuntu.com/results/autopkgtest-mantic/mantic/amd64/m/mawk/20240208_114537_49781@/artifacts.tar.gz 2>/dev/null | tar xvzOf - testinfo.json
testinfo.json
{
 "virt_server": "autopkgtest-virt-ssh -s /home/ubuntu/autopkgtest/ssh-setup/nova -- --flavor stag-cpu2-ram4-disk20 --security-groups <email address hidden> --name 'adt-mantic-amd64-mawk-20240208-114009-juju-97cf5d-stg-proposed-migration-environment-23-$UUID' --image adt/ubuntu-mantic-amd64-server --keyname testbed-juju-97cf5d-stg-proposed-migration-environment-23 --net-id=net_stg-proposed-migration-environment -e TERM=linux -e ''\"'\"'http_proxy=http://squid.internal:3128'\"'\"'' -e ''\"'\"'https_proxy=http://squid.internal:3128'\"'\"'' -e ''\"'\"'no_proxy=127.0.0.1,127.0.1.1,login.ubuntu.com,localhost,localdomain,novalocal,internal,archive.ubuntu.com,ports.ubuntu.com,security.ubuntu.com,ddebs.ubuntu.com,changelogs.ubuntu.com,launchpadlibrarian.net,launchpadcontent.net,launchpad.net,10.24.0.0/24,keystone.ps5.canonical.com,objectstorage.prodstack5.canonical.com'\"'\"'' --mirror=http://ftpmaster.internal/ubuntu/",
 "kernel_version": "Linux 6.5.0-17-generic #17-Ubuntu SMP PREEMPT_DYNAMIC Thu Jan 11 14:01:59 UTC 2024",
 "custom_environment": [
  "ADT_TEST_TRIGGERS=mawk/1.3.4.20230730-1"
 ],
 "nproc": "2",
 "cpu_model": "AMD EPYC-Rome Processor",
 "cpu_flags": "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good nopl cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext perfctr_core ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr wbnoinvd arat npt nrip_save umip rdpid",
 "all-proposed": null
}
```

With all-proposed:
```
❯ curl https://autopkgtest.staging.ubuntu.com/results/autopkgtest-mantic/mantic/amd64/m/mawk/20240208_114848_668c6@/artifacts.tar.gz 2>/dev/null | tar xvzOf - testinfo.json
testinfo.json
{
 "virt_server": "autopkgtest-virt-ssh -s /home/ubuntu/autopkgtest/ssh-setup/nova -- --flavor stag-cpu2-ram4-disk20 --security-groups <email address hidden> --name 'adt-mantic-amd64-mawk-20240208-114538-juju-97cf5d-stg-proposed-migration-environment-23-$UUID' --image adt/ubuntu-mantic-amd64-server --keyname testbed-juju-97cf5d-stg-proposed-migration-environment-23 --net-id=net_stg-proposed-migration-environment -e TERM=linux -e ''\"'\"'http_proxy=http://squid.internal:3128'\"'\"'' -e ''\"'\"'https_proxy=http://squid.internal:3128'\"'\"'' -e ''\"'\"'no_proxy=127.0.0.1,127.0.1.1,login.ubuntu.com,localhost,localdomain,novalocal,internal,archive.ubuntu.com,ports.ubuntu.com,security.ubuntu.com,ddebs.ubuntu.com,changelogs.ubuntu.com,launchpadlibrarian.net,launchpadcontent.net,launchpad.net,10.24.0.0/24,keystone.ps5.canonical.com,objectstorage.prodstack5.canonical.com'\"'\"'' --mirror=http://ftpmaster.internal/ubuntu/",
 "kernel_version": "Linux 6.5.0-17-generic #17-Ubuntu SMP PREEMPT_DYNAMIC Thu Jan 11 14:01:59 UTC 2024",
 "custom_environment": [
  "ADT_TEST_TRIGGERS=mawk/1.3.4.20230730-1"
 ],
 "nproc": "2",
 "cpu_model": "AMD EPYC-Rome Processor",
 "cpu_flags": "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good nopl cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext perfctr_core ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr wbnoinvd arat npt nrip_save umip rdpid",
 "all-proposed": "1"
}
```