Add raw deployment deployer

[creydr]

Changes

• :gift: Adds the possibility to deploy the function as a raw kubernetes deployment instead of a knative service
  • Updated the existing integration tests for the deployer, describer, remover and lister and made them generic, so I could reuse them for the raw deployments too
  • Updated clients WithLister(), WithDescriber(), WithRemover(), to accept a variadic argument list. Then letting the coresponding lister/describer/remover handle the action.
  • Added the deployer as a new column in the list command

$ func deploy --registry localhost:50000 --deployer raw
Building function image
Still building
🙌 Function built: localhost:50000/go-http-func:latest
Pushing function image to the registry "localhost:50000" using the "" user credentials
🎯 Creating Triggers on the cluster
✅ Function deployed in namespace "default" and exposed at URL: 
   http://go-http-func.default.svc.cluster.local

$ func list                                                       
NAME          NAMESPACE  RUNTIME  DEPLOYER     URL                                             READY
go-http-func  default             raw          http://go-http-func.default.svc                 True
go-http-ksvc  default             knative      http://go-http-ksvc.default.127.0.0.1.sslip.io  True

$ func describe go-http-func                                      
Function name:
  go-http-func
Function is built in image:
  
Function is deployed in namespace:
  default
Routes:
  http://go-http-func.default.svc
Deployer:
  raw
Labels:
  boson.dev/function: true
  function.knative.dev/name: go-http-func
  function.knative.dev/runtime: go

$ k get ksvc
NAME            URL                                               LATESTCREATED         LATESTREADY           READY   REASON
go-http-ksvc    http://go-http-ksvc.default.127.0.0.1.sslip.io    go-http-ksvc-00001    go-http-ksvc-00001    True    

$ k get ksvc go-http-func # <-- no Knative Service deployment for our function !
Error from server (NotFound): services.serving.knative.dev "go-http-func" not found

$ k get deploy
NAME                             READY   UP-TO-DATE   AVAILABLE   AGE
go-http-func                     1/1     1            1           47s

$  k get svc   
NAME                                    TYPE           CLUSTER-IP      EXTERNAL-IP                                         PORT(S)                                              AGE
go-http-func                            ClusterIP      10.96.173.129   <none>                                              80/TCP                                               62s
...

/kind enhancement

Fixes: #2804

Release Note

Add the possibility to deploy a function as raw kubernetes deployment via the --deployer=raw argument

[codecov[bot]]

Codecov Report

:x: Patch coverage is 38.09812% with 1022 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 59.77%. Comparing base (af45a47) to head (70c7019). :warning: Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/deployer/testing/integration_test_helper.go	0.00%	626 Missing :warning:
pkg/k8s/deployer.go	78.10%	59 Missing and 31 partials :warning:
pkg/remover/testing/integration_test_helper.go	0.00%	58 Missing :warning:
pkg/lister/testing/integration_test_helper.go	0.00%	50 Missing :warning:
cmd/completion_util.go	0.00%	24 Missing :warning:
pkg/testing/k8s/testing.go	0.00%	20 Missing :warning:
pkg/k8s/logs.go	78.20%	14 Missing and 3 partials :warning:
pkg/k8s/remover.go	43.33%	12 Missing and 5 partials :warning:
pkg/knative/describer.go	37.50%	13 Missing and 2 partials :warning:
pkg/k8s/wait.go	77.04%	7 Missing and 7 partials :warning:
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3075      +/-   ##
==========================================
- Coverage   62.35%   59.77%   -2.59%     
==========================================
  Files         150      162      +12     
  Lines       13522    14763    +1241     
==========================================
+ Hits         8432     8824     +392     
- Misses       4112     4887     +775     
- Partials      978     1052      +74     

Flag	Coverage Δ
e2e-tests	41.50% <46.20%> (+0.72%)	:arrow_up:
integration-tests	54.51% <34.22%> (-1.36%)	:arrow_down:
unit-tests	45.53% <4.78%> (-3.93%)	:arrow_down:

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[creydr]

Rebased after #3100 was in

[creydr]

/cc @lkingland @gauron99 @matzew Ready for review

[creydr]

Rebased to fix merge conflicts

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, lkingland

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[gauron99]

/lgtm