remove abandoned styleci bridge

[dbu]

Q	A
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Related tickets	fixes #266
Documentation	(not mentioned in the doc)
License	MIT

What's in this PR?

Remove configuration for the styleci php-cs-fixer bridge

Why?

The bridge is abandoned. styleci seems to not offer anything to run codestyle locally with the same configuration as their service.
Imho its enough to have the automated check.

Checklist

• Updated CHANGELOG.md to describe BC breaks / deprecations | new feature | bugfix

[dbu]

if we agree that this is the correct move, i will remove the file from client-common, boilerplate, curl-client, plugins, message, discovery, guzzle6-adapter, mock-client, chache-client and react-adapter.

[Nyholm]

I agree to remove the bridge since it does not work

If we only want to maintain one config file for style, there is Pretty CI by @mnapoli.

[sagikazarmark]

I agree as well. PrettyCI looks cool, I used FlintCI before, which accepted plain phpcs config, not sure if PrettyCI does.

Can you check if you can disable StyleCI? Do I need to grant some privileges?

[mnapoli]

Hello there! Just answering the question and I'll be out of here: if you want to use it then yes you can use a custom phpcs config, see https://prettyci.com/documentation

[dbu]

see #278

[dbu]

replaced by #278