refactor: Allow provisioner jobs to be disconnected from projects

[kylecarbs]

This enables flows for validating project versions before committing to an update.

# Making modifications to Terraform...
$ coder projects plan .
# Job run output so they can see if it's successful.
# We'll also output expected resources, and whether they have agents assigned or not.

By doing this, we also allow for a nice creation flow. Variables can be parsed and validated before a project has been created.

$ coder projects create .
? Set up "/tmp/asd" in organization? [Y/n] 
? What's your project's name? (asd) testing
◲ Parsing project source for variables...
19:27:00  [coder] Unpacking archive...
19:27:00  [coder] Unpacked archive: 642ms
19:27:00  [terraform] Initializing...
19:27:00  [coder] Found variables!
◲ Missing required parameters!
? Enter a value for "aws_secret_key": <some secret>
? Enter a value for "aws_access_key": <some secret>

> Project imported!

  Parameters

    aws_access_key (inherited from organization)
    aws_secret_key (inherited from organization)
    region (user-specifiable, defaults to "us-central1-a")

  Resources

    ec2_disk
    ec2_instance (deleted when workspace stops)

[codecov]

Codecov Report

Merging #194 (91112e5) into main (4c5e443) will decrease coverage by 0.28%.
The diff coverage is 69.92%.

@@            Coverage Diff             @@
##             main     #194      +/-   ##
==========================================
- Coverage   68.14%   67.86%   -0.29%     
==========================================
  Files         108      110       +2     
  Lines        5795     5953     +158     
  Branches       68       68              
==========================================
+ Hits         3949     4040      +91     
- Misses       1474     1524      +50     
- Partials      372      389      +17     

Flag	Coverage Δ
unittest-go-macos-latest	65.65% <69.92%> (-0.34%)	⬇️
unittest-go-ubuntu-latest	67.18% <69.92%> (+0.13%)	⬆️
unittest-go-windows-latest	65.65% <69.92%> (-0.25%)	⬇️
unittest-js	64.66% <ø> (ø)

Impacted Files	Coverage Δ
coderd/provisionerjobs.go	66.32% <52.63%> (ø)
codersdk/provisioners.go	57.28% <53.57%> (-4.45%)	⬇️
coderd/projects.go	62.96% <54.76%> (-5.00%)	⬇️
coderd/files.go	67.56% <67.56%> (ø)
coderd/projectversion.go	63.20% <67.74%> (-3.47%)	⬇️
httpmw/projectversionparam.go	72.50% <70.00%> (-3.98%)	⬇️
coderd/provisionerdaemons.go	52.50% <73.46%> (+0.97%)	⬆️
coderd/projectparameter/projectparameter.go	70.13% <74.07%> (+1.71%)	⬆️
codersdk/files.go	76.92% <76.92%> (ø)
codersdk/client.go	56.16% <78.57%> (+4.64%)	⬆️
... and 14 more

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[bryphe-coder]

LGTM 👍