Add compatibility code to the entrypoint so new EEs work with old runner version

[AlanCoding]

In #957 we combined 2 callback names (awx_display, minimal) into just 1, awx_display. Fundamentally, this makes it hard for the containers to work with ansible-runner versions before/after, and vice versa. Ping review by @shanemcd

In that PR, I paid attention to the ability for current ansible-runner to work with old images.

I was failing to fully appreciate the implications of old ansible-runner not working with current images.

This PR adds a shim to the entrypoint so that the image with work even if used by old versions of ansible-runner. In the PR 957 I removed the use of the LAUNCHED_BY_RUNNER environment variable. This allows using that as a poor proxy for the version of ansible-runner that is starting the container.

@rebeccahhh pointed out to me that our tests for AAP controller 4.1.x were failing due to these problems. I've re-tested those with a custom image built from this branch, quay.io/alancoding/ansible-runner:marty_youve_got_to_come_back_with_me, and this gets them to pass.

There's no reasonable way to ever get test coverage, because the whole idea is compatibility with old versions. So I am working on running make test with that custom image tagged as quay.io/ansible/ansible-runner:devel while I have the commit f1b6c3a checked out, which was the last commit before the PR landed.

[AlanCoding]

I think I've confirmed passing tests locally

2095 passed, 2 skipped, 1 xpassed in 143.30s (0:02:23)

With source tree

$ git status
HEAD detached at f1b6c3a

and images

(env) [alancoding@alan-red-hat ansible-runner]$ podman images quay.io/ansible/ansible-runner:devel
REPOSITORY                         TAG                                   IMAGE ID      CREATED       SIZE
quay.io/alancoding/ansible-runner  devel                                 526a9df2d92a  14 hours ago  887 MB
quay.io/alancoding/ansible-runner  marty_youve_got_to_come_back_with_me  526a9df2d92a  14 hours ago  887 MB
quay.io/ansible/ansible-runner     devel                                 526a9df2d92a  14 hours ago  887 MB
(env) [alancoding@alan-red-hat ansible-runner]$ docker images quay.io/ansible/ansible-runner:devel
REPOSITORY                       TAG       IMAGE ID       CREATED        SIZE
quay.io/ansible/ansible-runner   devel     bf1c2e76aa12   12 hours ago   859MB

the 14/12 hours ago would indicate the one built locally.

[shanemcd]

Doh!

[ansible-zuul]

LGTM!