Calling #present? was causing a DB query to happen each time around the
loop. We only wanted to check for nil as it's nil in the first loop
around so there is no need for #present?

Kubernetes deployments on new clusters will now have
a separate namespace per project environment, instead
of sharing a single namespace for the project.

Behaviour of existing clusters is unchanged.

All new functionality is controlled by the
:kubernetes_namespace_per_environment feature flag,
which is safe to enable/disable at any time.

- Closes #60024

- Change PrometheusClient.new to accept a base url instead of an
  already created RestClient

- Use Gitlab::HTTP in PrometheusClient instead of creating RestClient
  in PrometheusService

- Move http_options from PrometheusService to
  PrometheusClient (follow_redirects: false)

- ensure that base urls don't have the trailing slash

- Created a `PrometheusClient#url` method that might not be strictly
  required

- Change rescued exceptions from RestClient::* to
  HTTParty::ResponseError where possible and StandardError for the
  rest

Resolve "Kubernetes > Applications > Uninstall Cert Manager"

See merge request gitlab-org/gitlab-ce!31166

Add outbound setting for system hooks

See merge request gitlab-org/gitlab-ce!31177

Our current version of Cert-Manager does not uninstall
cleanly, and we must manually remove custom resource
definitions.

Also creates specs

Only allow Helm to be uninstalled if it's the only app

- Remove Tiller leftovers after reser command
- Fixes specs and offenses

Adds changelog file

Fix reset_command specs

This MR adds new application setting to network section
`allow_local_requests_from_system_hooks`. Prior to this change
system hooks were allowed to do local network requests by default
and we are adding an ability for admins to control it.

Resolve "Fix typo on clusters_applications_cert_managers factory"

Closes #65297

See merge request gitlab-org/gitlab-ce!31278