FBX exporter has an "All Actions" checkbox option enabled by default, which (1) exports all actions in the file and (2) removes associations between specific actions and what objects they map to, so any animated object can use any action. There isn't anything in the screenshot that suggests that that's whats happening here. The only limitation is that each exported action has to map directly to exactly to one Action strip on each NLA track, as any greater number would obviously require re-sampling in some way or another. Multiple actions work fine last I checked, as long as you have multiple NLA tracks. This bug isn't lack of support for multiple actions.
If FBX export is able to do it, and stackexchange has a list of steps to fix the issue, surely that means it can be fixed, or at the very least those steps can be automated into a single command ("Make NLA Tracks Exportable") or I think your screenshot is showing different channels in the the Action Editor rather than multiple tracks the NLA Editor, and in fact the Outliner panel shows that there are only 2 NLA tracks on the Armature, both of which have been stashed rather than pushed down, and are thus locked and muted with generic names that may be in conflict with each other and with the valid character set? Here you can see that if I use FBX export the exact same blend file, all the NLA animations show up fine in Unity: Related stackexchange post explaining how to fix this manually but I couldn't understand half the things it asked me to do: Since it hinders the adoption of glTF and it's been open for two years, I think this should be considered a bug not an enhancement. The file exports to FBX correctly with all animations intact, so the issue clearly lies with the glTF exporter. (If it would be helpful for debugging, I could try to share the blend file.) I confirmed this by opening up the resulting glTF file and there's only one item in the "animations" array.
It looks like this blend file does use NLA track, but only one animation is being exported. Here you can see an example file with all the actions: I'm trying to help a user export content to glTF and they are hitting a wall.
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