Update molecule images for upgrades

[mikedep333]

These are the images used for release-upgrade

platforms:
  - <<: *platform_base
    name: centos-7
    # molecule often fails to pull, so we pull all images in .travis.yml
    image: quay.io/pulp/pulp_rpm-ci-c7:3.1.0
    command: /sbin/init
  - <<: *platform_base
    name: debian-11
    image: quay.io/pulp/pulp-ci-dbullseye:3.14.4
    command: /sbin/init
  - <<: *platform_base
    name: fedora-33
    image: quay.io/pulp/pulp_rpm-ci-f33:3.9.0
    command: /usr/sbin/init

And these are the images used for source-upgrade:

platforms:
  - <<: *platform_base
    name: debian-11
    # molecule often fails to pull, so we pull all images in .travis.yml
    image: quay.io/pulp/pulp-ci-dbullseye:3.14.4
    command: /sbin/init
  - <<: *platform_base
    name: fedora-33
    image: quay.io/pulp/pulp_rpm-ci-f33:3.9.0
    command: /usr/sbin/init

There are 3 shortcomings:

1. centos-7 is not tested for source-upgrade
2. centos-8 is not tested at all (this was an omission I made due to being a hurry a few years ago). It should be created for a version inbetween 3.14 and 3.18.
3. fedora 33 is EOL should be replaced with Fedora 35. The images should be created for the latest version, 3.18.

We should also document how we create them. The most important step (docker commit) is listed here:
https://github.com/pulp/pulp_installer/blob/main/docs/contributing.md

Rough list of steps:

1. Identify the version of pulpcore/pulp_installer you want to create the image from.
2. If the version is old, put the variables for the plugin versions in molecule/release-static/group_vars/all . You'll need to research compatible versions. This will be an ad-hoc modification to the file.
3. Ad-hoc modify molecule/release-static/group_vars/all for any differences vs the intended test, such as the webserver.
4. run molecule create && molecule converge (defaults to release-static)
5. Run docker commit
6. Modify molecule.yml
7. Run the upgrade test.
8. Upload the images to quay.io (or whatever new repo we are using.)

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