Parsing and linting isn't working

Steps to reproduce:
```
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak install flathub org.kde.kdevelop
flatpak install org.freedesktop.Sdk.Extension.llvm13
flatpak run org.kde.kdevelop
```

Output:
```
kdevplatform.util: Path::init: invalid/unsupported Path encountered: http://clang-tidy
kdevplatform.shell: Can't load plugin "kdevclangsupport" because a factory to load the plugin could not be obtained: "Cannot load library /app/lib/plugins/kdevplatform/511/kdevclangsupport.so: (libclang.so.13: cannot open shared object file: No such file or directory)"
kdevplatform.shell: Can't load plugin "kdevclangsupport" because a factory to load the plugin could not be obtained: "Cannot load library /app/lib/plugins/kdevplatform/511/kdevclangsupport.so: (libclang.so.13: cannot open shared object file: No such file or directory)"
kf.solid.backends.udisks2: Failed enumerating UDisks2 objects: "org.freedesktop.DBus.Error.Disconnected"
"Not connected to D-Bus server"
```

Expected Result:
Parsing and/or linting to work. But it doesn't. No errors show in the text editor while purposefully producing errors in code.
Tried to solve via:

```
flatpak run --env=PATH=/app/bin:/usr/bin:/usr/lib/sdk/llvm13/bin --system-talk-name="org.freedesktop.UDisks2" org.kde.kdevelop

```

which only gets rid of the udisk issue, but it still can't find libclang.so.13 which kdevclangsupport.so needs

If opening this flatpak version of Kdevelop is particularly involved, it would probably be worth putting instructions somewhere