Merge pull request zendesk#3642 from zendesk/grosser/bump

bump gems we will need for rails 6

Merge pull request zendesk#3640 from zendesk/grosser/airbrake

remove airbrake user informer since it no longer works on rails 6

Merge pull request zendesk#3641 from zendesk/grosser/ssl

rework ssl for rails 6

Merge pull request zendesk#3635 from zendesk/grosser/delete-kritis

PAAS-5242 do not enforce env/secrets when deleting

Merge pull request zendesk#3638 from zendesk/grosser/valid2

preview what names will change when assigning namespace to a project

Merge pull request zendesk#3637 from zendesk/grosser/namespace-valida…

…tion

Simplify flashes and add warning flash

Merge pull request zendesk#3636 from zendesk/grosser/namespace-team

PAAS-5287 namespaces need team labels

Merge pull request zendesk#3628 from zendesk/grosser/owners

add owners to env groups

Merge pull request zendesk#3634 from zendesk/grosser/groups

PAAS-5207 supported secrets with unknown project/group/env

Merge pull request zendesk#3627 from zendesk/dtran/webhook_fix_1

Outbound hook adjustments