feat: reload Config before running command

[mdonnalley]

Proof of concept for fixing Config mismatch issue described here

$ sf update -v 2.5.7
$ cd plugin-plugins
$ sf plugins link
$ sf plugins --core
    TypeError: this.config.getPluginsList is not a function
$ yarn link @oclif/ocre
$ sf plugins --core
@oclif/plugin-autocomplete 2.3.6 (core)
@oclif/plugin-commands 2.2.22 (core)
@oclif/plugin-help 5.2.17 (core)
@oclif/plugin-not-found 2.3.37 (core)
@oclif/plugin-plugins 3.3.0 (link) /Users/mdonnalley/repos/oclif/plugin-plugins
@oclif/plugin-search 0.0.22 (core)
@oclif/plugin-update 3.1.32 (core)
@oclif/plugin-version 1.3.8 (core)
@oclif/plugin-warn-if-update-available 2.0.48 (core)
@oclif/plugin-which 2.2.30 (core)
@salesforce/cli 2.5.7 (core)
apex 2.3.10 (core)
auth 2.8.12 (core)
data 2.5.6 (core)
deploy-retrieve 1.17.5 (core)
info 2.6.39 (core)
limits 2.3.30 (core)
login 1.2.26 (core)
org 2.10.0 (core)
schema 2.3.23 (core)
settings 1.4.25 (core)
sobject 0.2.4 (core)
source 2.10.31 (core)
telemetry 2.3.0 (core)
templates 55.5.10 (core)
trust 2.6.1 (core)
user 2.3.28 (core)