The Plan.Submit endpoint assumed PlanRequest.Plan was never nil. While
there is no evidence it ever has been nil, we should not panic if a nil
plan is ever submitted because that would crash the leader.

deps: update api go version and dependencies

Merge pull request #11883 from hashicorp/dependabot/go_modules/github.com/prometheus/client_golang-1.12.0

build(deps): bump github.com/prometheus/client_golang from 1.7.1 to 1.12.0

This PR sets the minimum Go version for the `api` submodule to Go 1.17.

It also upgrades
 - gorilla/websocket 1.4.1 -> 1.4.2
 - mitchelh/mapstructure 1.4.2 -> 1.4.3
 - stretchr/testify 1.5.1 -> 1.7.0

Closes #11518 #11602 #11528

Merge pull request #11836 from hashicorp/dependabot/go_modules/github.com/hashicorp/memberlist-0.3.1

chore(deps): bump github.com/hashicorp/memberlist from 0.2.2 to 0.3.1

The volumewatcher that runs on the leader needs to make RPC calls
rather than writing to raft (as we do in the deploymentwatcher)
because the unpublish workflow needs to make RPC calls to the
clients. This requires that the volumewatcher has access to the
leader's ACL token.

But when leadership transitions, the new leader creates a new leader
ACL token. This ACL token needs to be passed into the volumewatcher
when we enable it, otherwise the volumewatcher can find itself with a
stale token.

The examples for `nomad volume create` and `nomad volume register` are
not setting `mount_flags` using an array of strings.

This fixes the issue by changing the example to be `mount_flags =
["noatime"]`.

build: upgrade circleci configuration

e2e: enable Consul HTTPS port and always restart Nomad systemd unit

deps: upgrade containernetworking/plugins

Upgrade containernetworking/plugins to v1.0.1 release, along with
its transitive dependencies.

Closes #11108

This PR upgrades our CI images and fixes some affected tests.

- upgrade go-machine-image to premade latest ubuntu LTS (ubuntu-2004:202111-02)

- eliminate go-machine-recent-image (no longer necessary)

- manage GOPATH in GNUMakefile (see https://discuss.circleci.com/t/gopath-is-set-to-multiple-directories/7174)

- fix tcp dial error check (message seems to be OS specific)

- spot check values measured instead of specifically 'RSS' (rss no longer reported in cgroups v2)

- use safe MkdirTemp for generating tmpfiles

NOT applied: (too flakey)

- eliminate setting GOMAXPROCS=1 (build tools were also affected by this setting)

- upgrade resource type for all imanges to large (2C -> 4C)

ui:  fix linter and prettier

Async tests should use  in integrations tests.
Acceptance tests are using Mirage and can't use
since we can't know the number of assertions.

Classic components still use tagName decorator

Classic components use lifecycle hooks.

This is a mixed codebase and still uses classic components

We have ~60 uses of computed properties across routes (for watcher system), components,
and models.

We still use classic classes because this is a mixed
codebase between Octane and Classic.

changelog: manually add entry for #11793

deps: pty has new home

github.com/kr/pty was moved to github.com/creack/pty

Swap this dependency so we can upgrade to the latest version
and no longer need a replace directive.

deps: replace gzip handler