Backport nodeSelectors for install and demo

[ksubrmnn]

Description:
Cherry-picks 94fc23d and 1a7d0b5 for v0.9.1,
required to address #3509 with v0.9.

Affected area:

Functional Area
New Functionality	[ ]
Documentation	[ ]
Install	[X]
CLI Tool	[ ]
Certificate Management	[ ]
Control Plane	[ ]
Ingress	[ ]
Egress	[ ]
Networking	[ ]
Observability	[ ]
SMI Policy	[ ]
Sidecar Injection	[ ]
Security	[ ]
Upgrade	[ ]
Tests	[ ]
CI System	[ ]
Demo	[X]
Performance	[ ]
Other	[ ]

Please answer the following questions with yes/no.

1. Does this change contain code from or inspired by another project?
   • Did you notify the maintainers and provide attribution?
     No
2. Is this a breaking change?
   No

[codecov-commenter]

Codecov Report

Merging #3625 (bdd664c) into release-v0.9 (96498ba) will increase coverage by 0.77%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           release-v0.9    #3625      +/-   ##
================================================
+ Coverage         65.82%   66.59%   +0.77%     
================================================
  Files               169      169              
  Lines              7886     7904      +18     
================================================
+ Hits               5191     5264      +73     
+ Misses             2664     2609      -55     
  Partials             31       31              

Flag	Coverage Δ
unittests	66.59% <ø> (+0.77%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/injector/webhook.go	79.05% <0.00%> (ø)
pkg/injector/iptables.go	100.00% <0.00%> (ø)
pkg/configurator/mock_client_generated.go	0.00% <0.00%> (ø)
pkg/injector/patch.go	77.19% <0.00%> (+0.40%)	⬆️
pkg/configurator/methods.go	69.01% <0.00%> (+0.44%)	⬆️
pkg/ingress/client.go	77.08% <0.00%> (+67.30%)	⬆️

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