PIPE-2315 - Removes API-Service from config compilation

[elliotforbes]

A follow-up PR that migrates the config compilation from the unstable GraphQL service and pipes it directly to an internal service.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have checked for similar issues and haven't found anything relevant.
• This is not a security issue (which should be reported here: https://circleci.com/security/)
• I have read Contribution Guidelines.

Internal Checklist

• I am requesting a review from my own team as well as the owning team
• I have a plan in place for the monitoring of the changes that I am making (this can include new monitors, logs to be aware of, etc...)

Changes

• This removes the dependency on the unstable GraphQL api for config compilation and validation.
• It also adds a number of cucumber tests to exercise this change.

Rationale

We're looking to simplify the way config compilation and validation request flow through our system.

Considerations

We'll be monitoring the rollout of this via metrics to ensure that it has the desired effect. We'll also be communicating to support teams that this is going live and to raise up any CLI related support issues immediately to the Pipeline's team.

Manual Validation

Build Command: make build

[x] - Private orb resolution fails if owner_id not specified -

$ ./build/darwin/amd64/circleci config validate .circleci/config.yml
$ Error: config compilation contains errors: [{Cannot find REDACTED in the orb registry. Check that the namespace, orb name and version are correct.

[x] - Private orb resolution fails if org is specified and no valid token -

$ export CIRCLECI_CLI_TOKEN=
$ ./build/darwin/amd64/circleci config validate .circleci/config.yml --org-slug gh/circleci
$ Error: config compilation contains errors: [{Cannot find REDACTED in the orb registry. Check that the namespace, orb name and version are correct.}]

[x] - Private orb resolution works if token specified with org -

$ ./build/darwin/amd64/circleci config validate .circleci/config.yml --org-slug gh/circleci  --token REDACTED
$ Config file at .circleci/config.yml is valid.

[x] - Private orb resolution works with env variable token -

$ export CIRCLECI_CLI_TOKEN=REDACTED
$ ./build/darwin/amd64/circleci config validate .circleci/config.yml --org-slug gh/circleci 
$ Config file at .circleci/config.yml is valid.

[x] - Normal config validation works as expected -

$ ./build/darwin/amd64/circleci config validate .circleci/config.yml
$ Config file at .circleci/config.yml is valid.

[x] - Config processing works -

$ ./build/darwin/amd64/circleci config process .circleci/config.yml
$ config output

[x] - Config processing works with private orb and token + org combo -

$ ./build/darwin/amd64/circleci config process .circleci/config.yml --org-slug gh/circleci
$ config output

[x] - Config processing fails with token but no org

$ ./build/darwin/amd64/circleci config process .circleci/config.yml
$ Error: config compilation contains errors: [{Cannot find REDACTED in the orb registry. Check that the namespace, orb name and version are correct.}]