Resources conflict in different namespaces

[exu]

Describe the bug
When we have e.g. 2 scripts with the same name in 2 namespaces we can get a conflict when working on top of them

Steps to reproduce:

1. Create a test in ns1
2. Create a test in ns2
3. try to list executions for both tests
4. ....

Additional context:
Check all namespace related actions in the context of conflicting scripts/tests

@nicufk @vsukhin @nicufk @jasmingacic we need to define what script/test id is for us - as currently we're using name - and in context of namespaced resources we'll get conflicts :/

[exu]

I think one of the possible solutions is to make ID as some kind of namespace-name pair (namespaced name) and unmarshal it into resrource ref in code

[vsukhin]

Or add unique suffix for each script like kubernetes did for each pod replica