Deploy keys credentials inventory - remove On suffixes from column headers

Problem to solve

Compliance-minded organizations require insight into the access individuals have to their systems. We're launching an inventory of PAT and SSH credentials in %12.6, which begins to provide this insight to customers. Missing still is Deploy Keys so that customers can have a more holistic view of access to their GitLab environment.

Intended users

• Sidney (Systems Administrator)

Personas are described at https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/ -->

Further details

This is an iteration to add Deploy Keys to an existing credential inventory accessible by Administrators.

Proposal

Add Deploy Keys to the credential inventory.

Title	Fingerprint	Read-only access	Read-write access	Created	(Actions)
Admin deploy key	d2:e8:be:cf:fd:a7:b4:fd:a7:b4	2 projects	1 project	20201-01-01

Empty state

Preview
illustrations_empty-state_empty-deploy-keys-lg.svg](https://gitlab.com/gitlab-org/gitlab-svgs/blob/main/illustrations/empty-state/empty-deploy-keys-lg.svg) Deploy keys allow read-only or read-write (if enabled) access to your repository Deploy keys can be used for CI, staging or production servers. You can create a deploy key or add an existing one.

docs

Permissions and Security

Only Administrators can view this information within the Admin Panel

Implementation plan

1. Remove On suffixes from column headers in the credentials inventory - found in ee/app/views/shared/credentials_inventory
2. Update failing tests which expect the On suffix