Add support for hostipc, hostpid and hostnetwork

[skonto]

Fixes #12830

Proposed Changes

• Adds support for hostpid, hostipc, hostnetwork to make sure Kserve workloads are unblocked when utilizing MPS based gpu sharing. This long standing issue was faced recently here: When reasoning with huggingface server, NCCL error occurs when GPU>1 kserve/kserve#3791 and blocks adoption of serverless mode in KServe. With this patch we move to close the gap between our podpsec support and Kserve's.
• Continues work in WIP: Feature: added PodSpec.HostIPC extension #13310
• TODO: add documentation, also I noticed that kubernetes.podspec-shareprocessnamespace lacks documentation (pointer in the features yaml is broken), I will fix in the same docs PR.

Release Note

Allow hostPID, hostNetwork and HostIPC to be set for a Knative Service (feature flags: kubernetes.podspec-hostpid, kubernetes.podspec-hostnetwrok, kubernetes.podspec-hostipc). All features are disabled by default. 

[codecov]

Codecov Report

Attention: Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.

Project coverage is 84.57%. Comparing base (7d318cd) to head (e9dddaa).
Report is 18 commits behind head on main.

Files	Patch %	Lines
pkg/apis/serving/fieldmask.go	0.00%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15414      +/-   ##
==========================================
- Coverage   84.60%   84.57%   -0.04%     
==========================================
  Files         219      219              
  Lines       13587    13597      +10     
==========================================
+ Hits        11495    11499       +4     
- Misses       1725     1728       +3     
- Partials      367      370       +3     

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[skonto]

TestSubrouteLocalSTS/shortest failed with Contour. cc @dprotaso

[ReToCode]

/lgtm
/approve

/hold for @dprotaso

[skonto]

@dprotaso gentle ping.

[dprotaso]

/lgtm

[dprotaso]

/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, ReToCode, skonto

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[skonto]

/unhold