Add field to DevWorkspace to allow customizing any pod fields in deployment.

[amisevsk]

What does this PR do?:

Add support for specifying overrides to pod fields in DevWorkspaces. This PR is a draft for discussion.

The added pods field in the DevWorkspace CRD supports all fields copy-pasted from the pod spec itself, omitting containers and initContainers. In the future it may be worth automating the generation of this field from the pod spec directly.

Containers are omitted as

1. The CRD yaml size is dramatically increased if they are included, as it brings a lot of fields and documentation
2. It's not clear whether it should be supported, as many of those fields are already in the container component.

This changes adds 100KB to the DevWorkspace CRDs.

Which issue(s) this PR fixes:

Closes #860

PR acceptance criteria:

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened.

• Open new test/doc issues under the devfile/api repo
• Check each criteria if:
• There is a separate tracking issue. Add the issue link under the criteria
  or
• test/doc updates are made as part of this PR
• If unchecked, explain why it's not needed

• Unit/Functional tests

• QE Integration test

• Documentation

• Client Impact

How to test changes / Special notes to the reviewer:

[l0rd]

I have approved the PR although the pods field could be renamed as discussed in #860 (comment).

[amisevsk]

Updated field name to podSpecOverride as suggested. We can decide if it should apply to Kubernetes components down the line.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: amisevsk, l0rd

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[codecov-commenter]

Codecov Report

Base: 35.51% // Head: 34.75% // Decreases project coverage by -0.76% ⚠️

Coverage data is based on head (8a26991) compared to base (27328ab).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #872      +/-   ##
==========================================
- Coverage   35.51%   34.75%   -0.77%     
==========================================
  Files          52       52              
  Lines        6653     6799     +146     
==========================================
  Hits         2363     2363              
- Misses       4145     4291     +146     
  Partials      145      145              

Impacted Files	Coverage Δ
pkg/apis/workspaces/v1alpha2/devworkspace_types.go	100.00% <ø> (ø)
.../apis/workspaces/v1alpha2/zz_generated.deepcopy.go	0.00% <0.00%> (ø)

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