…uired (#29317) (#29327)

* fix(gatsby): use separate eslint-loader for rules that are always required

* Add the second loader only when custom eslint config is set

(cherry picked from commit a1543bf)

Co-authored-by: Vladimir Razuvaev <vladimir.razuvaev@gmail.com>

 - gatsby-admin@0.8.1
 - gatsby@2.32.1

* Feat: launch gatsby-source-wordpress v4 (#29150)

Co-authored-by: Vladimir Razuvaev <vladimir.razuvaev@gmail.com>
Co-authored-by: Ward Peeters <ward@coding-tech.com>
Co-authored-by: gatsbybot <mathews.kyle+gatsbybot@gmail.com>

(cherry picked from commit 862637b)

* fix dependency versions

* update yarn.lock

Co-authored-by: Tyler Barnes <tylerdbarnes@gmail.com>

 - create-gatsby@0.5.1
 - gatsby-admin@0.8.2
 - gatsby-cli@2.19.1
 - gatsby-recipes@0.9.1
 - gatsby-source-wordpress@4.0.0
 - gatsby@2.32.2

)

Co-authored-by: gatsbybot <mathews.kyle+gatsbybot@gmail.com>
(cherry picked from commit 1443ecd)

Co-authored-by: Matt Kane <matt@gatsbyjs.com>

 - gatsby-plugin-image@0.7.1
 - gatsby-plugin-sharp@2.14.1
 - gatsby-source-contentful@4.6.1
 - gatsby-transformer-sqip@2.11.1