feat: allow to pass undocumented tmt_context inputs

[jamacku]

Fixes #325

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.58%. Comparing base (be2daf3) to head (5b0bea7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #328   +/-   ##
=======================================
  Coverage   91.58%   91.58%           
=======================================
  Files          14       14           
  Lines         867      867           
  Branches      162      162           
=======================================
  Hits          794      794           
  Misses         73       73           

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[github-actions]

Testing Farm results

name	compose	arch	status	started (UTC)	time	logs
Smoke test - pull_request_target	Fedora-latest	x86_64	✅ passed	11.11.2025 13:05:52	58min 57s	test pipeline
Variables test	Fedora-latest	x86_64	✅ passed	11.11.2025 13:38:48	1h 28s	test pipeline
Secrets test	Fedora-latest	x86_64	✅ passed	11.11.2025 13:38:48	1h 31s	test pipeline
Timeout test	Fedora-latest	x86_64	✅ passed	11.11.2025 13:38:49	1h 5min 27s	test pipeline

[jamacku]

[test]