replace jinja-cli with local python script

[infinitewarp]

Packages for jinja-cli and jinja-cli2 are not available in our downstream build system. Our use case for rendering Jinja template content is very simple, though. So, I wrote this small script to use the jinja2 library directly (which we do have available downstream for both RHEL8 and RHEL9) to replace our single use of the jinja program, and I dropped jinja-cli from our Poetry environment and replaced it with just jinja2.

I deliberately made this a standalone script and not part of the qpc package because we want to run this as a build step downstream, and we don't need to install all of qpc just to generate the man page.

[codecov-commenter]

Codecov Report

Merging #285 (eb026ab) into main (4e4dc7a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #285   +/-   ##
=======================================
  Coverage   93.73%   93.73%           
=======================================
  Files          67       67           
  Lines        2827     2827           
=======================================
  Hits         2650     2650           
  Misses        177      177           

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[bruno-fs]

LGTM