Install cert-manager v0.9.1

What does this MR do?

Allows fresh install of cert-manager v0.9.1 but not upgrading. Upgrades will require a full uninstall and reinstall as we cannot easily migrate from the old stable/cert-manager chart to the new chart. The old chart will continue to work until November 1 when lets encrypt block old versions of cert-manager.

Issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/60434

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team