Treat resource types as checkable in rate limiter

[taylorsilva]

Changes proposed by this PR

Follow-up from #7102
Will be made irrelevant by #7176

check builds are created for resources and custom resource types. The
resource types were not being considered in the rate limit, so as soon
as you have any custom resource types there would always be check builds
that would get stuck by the rate limiter.

[aoldershaw]

Probably don't need the release note as the bug didn't exist in 7.3

[aoldershaw]

Just based on the duration of testflight, it doesn't look like this totally fixes the issue - notice how before #7102 was merged, testflight took ~20mins (https://ci.concourse-ci.org/teams/main/pipelines/concourse/jobs/testflight/builds/822), and after, it took ~40mins (or timed out) (https://ci.concourse-ci.org/teams/main/pipelines/concourse/jobs/testflight/builds/824).

This testflight run is currently at 40mins and counting

[taylorsilva]

Just noticed the timing too. Seems like we still got a mystery to solve 🤔

[aoldershaw]

The following test took ~15m:

concourse/testflight/resource_config_versions_test.go

Line 24 in 58526cc

It("will run both jobs only once even with a new custom resource type version", func() {

I've seen the same thing without this fix:
https://ci.concourse-ci.org/teams/main/pipelines/branch/jobs/testflight/builds/17.2?vars.branch=%22resource-causality%22#L60ced7f3:503:509

[taylorsilva]

We noticed these tests were taking over 400s to finish before:

concourse/testflight/resource_type_test.go

Line 11 in 5558b97

var _ = Describe("Configuring a resource type in a pipeline config", func() {

On my machine they could run under 100s. From this PR's checks they took under 400s now but still very slow.