Malformed /proc/<pid>/environ for Mattermost snap

/proc/<pid>/environ is malformed for the Mattermost snap:

```
hd /proc/$(pidof -s /snap/mattermost-desktop/578/opt/Mattermost/mattermost-desktop)/environ
00000000 64 69 73 61 62 6c 65 2d 66 65 61 74 75 72 65 73 |disable-features|
00000010 3d 53 70 61 72 65 52 65 6e 64 65 72 65 72 46 6f |=SpareRendererFo|
00000020 72 53 69 74 65 50 65 72 50 72 6f 63 65 73 73 20 |rSitePerProcess |
00000030 2d 2d 65 6e 61 62 6c 65 2d 63 72 61 73 68 70 61 |--enable-crashpa|
00000040 64 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |d...............|
00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00001930 00 00 00 00 00 00 00 00 00 00 |..........|
0000193a
```

/proc/<pid>/cmdline for this process:

/snap/mattermost-desktop/578/opt/Mattermost/mattermost-desktop --type=utility --utility-sub-type=audio.mojom.AudioService --lang=de --service-sandbox-type=none --enable-crashpad --enable-crash-reporter=c2de330d-b7d2-41f5-9225-1dc24df6cef3,no_channel --user-data-dir=/home/bdrung/snap/mattermost-desktop/578/.config/Mattermost --enable-sandbox --shared-files=v8_context_snapshot_data:100 --field-trial-handle=0,i,1292212183282703761,17487740677776085254,131072 --disable-features=SpareRendererForSitePerProcess --enable-crashpad

* OS: Ubuntu 22.10 (kinetic)
* snapd: 2.58+22.10
* linux-image-5.19.0-35-generic 5.19.0-35.36
* mattermost-desktop snap: 5.2.2 2022-12-12 (578)

See also https://github.com/canonical/apport/pull/143

I filed this bug against snapd, but it could also be a bug in the mattermost-desktop snap or the Linux kernel.