Merge pull request gocd#8752 from maheshp/upgrade_bc

Upgrade BC to 1.67, fixes gocd#8624

Fix stage overview caret icon positioning

Bug:
	When the stage overview for the rightmost pipeline on the
dashboard is opened, the overview caret icon is mis-positioned
initially and on the subsequent redraw its positioned appropriately.

Why did it happen?:
	The 'shouldAlignLeft' state was changed in the oncreate
lifecycle method, whereas, any state changes done in the oncreate
does not performs an immediate redraw. Such changes will be
reflected on the next periodic redraw.
	This behavior caused the caret icon to be positioned
appropriately on the subsequent redraws.

Fix:
	Do not store/update state as part of the oncreate method.
As we've the handle to the created element's DOM, add appropriate
classes to the DOM element within oncreate.

Showcase building job before passed jobs on the stage overview

Continue to build centos 6 image for this release, will be removed in…

… next release

Changed database upgrade links to the right documentation page #000

Revert "Merge pull request gocd#8177 from kritika-singh3/remove-empty…

…-task-list-validation"

This reverts commit e63a99a, reversing
changes made to a82dee7.

 - this is reverted as the validation makes sense.

Fix git installation on agent centos {6,7} docker images

Toggling back to the old comparison spa for the release

Update `shellwords-ts` to 3.0.0

Fix loading of edit task modal for templates

* @is_config_repo_pipeline variable is not available during templates load,
  default to false when the specified variable is not available.