Add Gitaly data to the usage ping

See merge request gitlab-org/gitlab-ce!29893

Use next_instance_of instead of any_instance_of

See merge request gitlab-org/gitlab-ce!29905

Backport changes made by EE to various YAML configuration files

See merge request gitlab-org/gitlab-ce!29606

For prepended classes, we need to use `expect_next_instance_of`
instead of RSpecs `any_instance_of` variants.

Errors in application settings panel shows wrong panel

See merge request gitlab-org/gitlab-ce!25434

This commits adds support for metrics dashboards
for embedding. If the flag 'embedded' is provided
to the environments/id/metrics_dashboard endpoint,
the response will be suitable for embedding in
issues or other content.

This is a precursor for support for embedding
metrics in GFM.

Gitaly data wasn't available to the team, an this change is a first
iteration towards understanding what data we need and how to interpret
it. Later more values will be added.

For now the most important thing is the filesystem String Array, as that
includes data on ext4 exposure and NFS.

Part of: https://gitlab.com/gitlab-org/gitlab-ce/issues/60602

Render last commit widget with Vue

Closes #62766

See merge request gitlab-org/gitlab-ce!29419

To make this happen, we need to conditionally add the group_saml
strategy when running tests, but only on EE. This requires some changes
to Gitlab.ee? so that it can be used before/without loading the Rails
environment. We also have to change how we require a few files, so this
can run outside of Rails.

Gitlab::JsonCache#parse_value ensure string

Closes #63510

See merge request gitlab-org/gitlab-ce!29885