Why this change?
This regressed in dec68d780c58ef0954865b786d04b653c20e26fa where the
commit assumes that plugin gems are always installed when the
`plugin:install_all_gems` Rake task is ran as it would run the our Rails
initializers which activates plugins and install the gems. However, this
assumption only holds true when the `LOAD_PLUGINS` is present and set to
`1`.
What does this change do?
This commit changes the `plugin:install_all_gems` to load the Rails
environment with `LOAD_PLUGINS` set to `1` such that the plugin gems
will be installed as part of our initialization process for the app.
The commit also removes the `plugin:install_gems` Rake task which is
currently a noop and does not seem to be used anywhere..
189aa5fa4e