[e2e] need to replace j2cli with something

[s1061123]

What would you like to be changed:

j2cli, used in e2e, is no longer active as kolypto/j2cli#80 (comment).
Currently github action works well, but j2cli does not work well with python (>=3.12), hence we need to replace it with something else.

Here is the requirements that I come up with:

• something familier with go
• less dependency (i.e. runtime version)

[s1061123]

Currently gomplate could be the candidate....