Add file show_all_imagestreams.py from container-common-scripts

[phracek]

This pull request only adds show_all_imagestreams.py so it is working.

The file show_all_imagestreams.py shows all available imagestreams for this container, that are specified in the directory imagestreams.

The example output will be seen in the next comment.

[phracek]

[test-openshift]

[phracek]

The results for RHEL8 - OpenShift 4 - 3.3 are:

-----------------------------------------------
Running test test_latest_imagestreams (starting at 2024-06-10 09:09:55-04:00) ... 
-----------------------------------------------
Tags in the image stream imagestreams/ruby-centos.json:
- latest -> 3.3-ubi9
- 3.3-ubi9 -> registry.access.redhat.com/ubi9/ruby-33:latest
- 3.1-ubi9 -> registry.access.redhat.com/ubi9/ruby-31:latest
- 3.0-ubi9 -> registry.access.redhat.com/ubi9/ruby-30:latest
- 3.1-ubi8 -> registry.access.redhat.com/ubi8/ruby-31:latest
- 3.0-ubi7 -> registry.access.redhat.com/ubi7/ruby-30:latest
- 2.5-ubi8 -> registry.access.redhat.com/ubi8/ruby-25:latest
Tags in the image stream imagestreams/ruby-rhel-aarch64.json:
- latest -> 3.3-ubi9
- 3.3-ubi9 -> registry.redhat.io/ubi9/ruby-33:latest
- 3.1-ubi9 -> registry.redhat.io/ubi9/ruby-31:latest
- 3.0-ubi9 -> registry.redhat.io/ubi9/ruby-30:latest
- 3.1-ubi8 -> registry.redhat.io/ubi8/ruby-31:latest
- 2.5-ubi8 -> registry.redhat.io/ubi8/ruby-25:latest
Tags in the image stream imagestreams/ruby-rhel.json:
- latest -> 3.3-ubi9
- 3.3-ubi9 -> registry.redhat.io/ubi9/ruby-33:latest
- 3.1-ubi9 -> registry.redhat.io/ubi9/ruby-31:latest
- 3.0-ubi9 -> registry.redhat.io/ubi9/ruby-30:latest
- 3.1-ubi8 -> registry.redhat.io/ubi8/ruby-31:latest
- 3.0-ubi7 -> registry.redhat.io/ubi7/ruby-30:latest
- 2.5-ubi8 -> registry.redhat.io/ubi8/ruby-25:latest
Version to check is 3.3.