Broken behat tests when running kitchen sink

[emteknetnz]

When doing a special run of kitchen-sink in CI that includes all behat tests, some of the behat tests fail due to integration failures with other modules

We don't normally run behat on all modules during kitchen sink runs, though we do sometimes when testing PR's the may have a wide ranging impact

It seems like there are issues with the following jobs:

• endtoend blog
• endtoend cms
• endtoend siteconfig
• endtoend subsites
• endtoend versioned-admin

Acceptance criteria

• Fix the integration issues so that behat tests pass

PRs

• MNT Remove tests for unsupported optional modules silverstripe-blog#763
• FIX Preview link when no locale set tractorcow-farm/silverstripe-fluent#861
• FIX Do not cache current site config silverstripe-siteconfig#165
• MNT Fix siteconfig behat test running on kitchen-sink silverstripe-cms#2959
• FIX Set RelatedPages gridfield to be structural cwp#339
• FIX Remove any extra added tabs from SingleTabPage silverstripe-frameworktest#185

[GuySartorelli]

PRs merged. Reassigning to Steve to check sink behat is happy now.

[GuySartorelli]

PRs merged, reassigning to steve to check behat is green now

[emteknetnz]

Green on rerun