Configuration: `--configOverrides=cfg:default.paths.plugins` and `GF_PATHS_PLUGINS` are silently ignored by `grafana cli`; `grafana server` prefers `GF_PATHS_PLUGINS` to configOverrides if both are set

TL;DR: `grafana cli plugins ls` and `grafana server` use completely different configuration for plugin paths, each ignoring the others' cli options and env-vars. `grafana server` also (surprisingly) prefers the env-var set plugin path to the cli-set plugin path if both are supplied. ### What happened? When invoking `grafana cli` with the CLI argument `--configOverrides=cfg:default.paths.plugins=/usr/lib/grafana/plugins`, the CLI ignores this setting and continues to look for plugins in `/var/lib/grafana/plugins`. The option is accepted but no warning is emitted. Using the `GF_PATHS_PLUGINS` env-var is similarly ineffective. Meanwhile for `grafana server`, the `--configOverrides=cfg:default.paths.plugins=/usr/lib/grafana/plugins` CLI option is ignored if the env-var `GF_PATHS_PLUGINS` is set, counter to the unix norm of CLI options overriding env-vars. No warning is emitted if both are set with conflicting values. The combination of these two behaviours leads to very confusing Grafana behaviour when overriding the plugins paths. ### What did you expect to happen? `grafana cli plugins ls` to report the same plugins as `grafana server` will find, when invoked with the same configuration and options. `grafana cli --configOverrides=cfg:default.paths.plugins=/usr/lib/grafana/plugins plugins ls` or `GF_PATHS_PLUGINS=/usr/lib/grafana/plugins grafana cli plugins ls` to list the plugins installed at `/usr/lib/grafana/plugins`. and the `grafana server` command to respect `--configOverrides=cfg:default.paths.plugins=/usr/lib/grafana/plugins`, overriding any value of `GF_PATHS_PLUGINS` in the environment. See: * [Docs for overriding configuration settings ](https://grafana.com/docs/grafana/latest/administration/cli/#override-a-configuration-setting) * [Grafana configuration docs, `paths.plugins` section](https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/#plugins) Instead, the CLI requires entirely different plugin configuration: * `grafana cli --pluginsDir…