Create conda package compatible with all available cpptango, zeromq and omniorb conda packages

[bourtemb]

By doing some tests with my personal conda channel (Reyn4ld) where I had a cpptango 9.4 conda package available, I realized that we will need to build several tango-test conda packages, one compatible with cpptango 9.3 and one compatible with cpptango 9.4 because cpptango 9.4 is not binary compatible with cpptango 9.3. I created some tests packages already on Reyn4ld conda channel.
We will probably have to do the same with the different major versions of omniorb and zeromq (to be done on cpptango conda package too).
I propose to merge this PR and I will create another or several other ones to ensure we create enough packages to support the different available versions of omniorb, zeromq and cpptango.
Ideally, they should be built in parallel by the github workflow.

Originally posted by @bourtemb in #10 (comment)