feat: Remove magical parameters from being injected

[kylecarbs]

This is a much cleaner abstraction. Explicitly declaring the user
parameters for each provisioner makes for significantly simpler
testing.

[codecov]

Codecov Report

Merging #371 (aed38ad) into main (bd0293a) will increase coverage by 0.32%.
The diff coverage is 82.85%.

@@            Coverage Diff             @@
##             main     #371      +/-   ##
==========================================
+ Coverage   67.85%   68.17%   +0.32%     
==========================================
  Files         150      148       -2     
  Lines        8333     8169     -164     
  Branches       72       72              
==========================================
- Hits         5654     5569      -85     
+ Misses       2103     2042      -61     
+ Partials      576      558      -18     

Flag	Coverage Δ
unittest-go-macos-latest	66.40% <80.64%> (+0.03%)	⬆️
unittest-go-ubuntu-latest	67.50% <82.85%> (+0.15%)	⬆️
unittest-go-windows-2022	?
unittest-js	66.10% <ø> (ø)

Impacted Files	Coverage Δ
cli/projectcreate.go	52.91% <ø> (+0.50%)	⬆️
coderd/coderd.go	95.37% <ø> (ø)
coderd/parameter/compute.go	71.85% <ø> (ø)
codersdk/files.go	66.66% <0.00%> (-10.26%)	⬇️
coderd/provisionerdaemons.go	59.52% <68.18%> (-0.18%)	⬇️
provisionerd/provisionerd.go	68.95% <78.57%> (-0.39%)	⬇️
coderd/cmd/root.go	82.43% <100.00%> (+0.48%)	⬆️
coderd/coderdtest/coderdtest.go	100.00% <100.00%> (ø)
provisioner/terraform/provider/provider.go	57.74% <100.00%> (+2.52%)	⬆️
provisioner/terraform/provision.go	74.64% <100.00%> (+0.44%)	⬆️
... and 8 more

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