[gnome-builder] plugins/gnome-code-assistance: remove GCA plugin

[Christian Hergert <chergert src gnome org>]

commit d351619951668663a143419a59164e311a60f493
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jul 11 22:49:54 2022 -0700

    plugins/gnome-code-assistance: remove GCA plugin
    
    This hasn't been used in forever, especially in light of how people run
    applications with Flatpak now.

 .../gnome-code-assistance/gca-diagnostics.c        | 1081 ----------------
 .../gnome-code-assistance/gca-diagnostics.h        |  170 ---
 src/plugins/gnome-code-assistance/gca-plugin.c     |   37 -
 src/plugins/gnome-code-assistance/gca-service.c    | 1343 --------------------
 src/plugins/gnome-code-assistance/gca-service.h    |  209 ---
 src/plugins/gnome-code-assistance/gca-structs.c    |  108 --
 src/plugins/gnome-code-assistance/gca-structs.h    |   66 -
 .../gnome-code-assistance.gresource.xml            |    6 -
 .../gnome-code-assistance.plugin                   |    9 -
 .../ide-gca-diagnostic-provider.c                  |  504 --------
 .../ide-gca-diagnostic-provider.h                  |   31 -
 .../ide-gca-preferences-addin.c                    |   88 --
 .../ide-gca-preferences-addin.h                    |   31 -
 .../gnome-code-assistance/ide-gca-service.c        |  275 ----
 .../gnome-code-assistance/ide-gca-service.h        |   43 -
 src/plugins/gnome-code-assistance/meson.build      |   23 -
 ...gnome.builder.gnome-code-assistance.gschema.xml |    9 -
 17 files changed, 4033 deletions(-)