mattermost: 8.1.10 → 9.5.1

This jumps Mattermost ESR Versions (see [1] for their release cycle). The
new version makes use of Go's workspace feature, which unfortunately the
buildGoModule function does not (yet?) support [2], which breaks the
previous build process for mattermost.

Further, the new release also makes use of private modules only included
in the (non-free) enterprise version of mattermost which makes it impossible
to build in the usual way even outside of nixpkgs's build abstractions [3].

Both issues can be solved by using Go 1.22, which has added support for
vendoring when using workspaces, and instructing it to ignore errors with
the -e flag. This requires overriding the go-modules derivation's
buildPhase, and still produces a functional binary.

[1] https://docs.mattermost.com/upgrade/extended-support-release.html
[2] https://github.com/NixOS/nixpkgs/issues/203039
[3] https://github.com/mattermost/mattermost/issues/26221

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