.dvc file: remove params support

[skshetry]

Part of #7093.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.24 ⚠️

Comparison is base (46f3157) 90.99% compared to head (1d42fa1) 90.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9551      +/-   ##
==========================================
- Coverage   90.99%   90.76%   -0.24%     
==========================================
  Files         472      472              
  Lines       36399    36397       -2     
  Branches     5219     5219              
==========================================
- Hits        33120    33034      -86     
- Misses       2706     2775      +69     
- Partials      573      588      +15     

Impacted Files	Coverage Δ
dvc/dependency/__init__.py	100.00% <ø> (ø)
dvc/dependency/param.py	94.73% <100.00%> (-0.10%)	⬇️

... and 22 files with indirect coverage changes

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