Ensure single mesh deployment is enforced in OSM by default

[snehachhabria]

Description:

Enforcing single mesh in a cluster by defalut for OSM.

part of #4162

Signed-off-by: Sneha Chhabria snchh@microsoft.com

Affected area:

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

Please answer the following questions with yes/no.

1. Does this change contain code from or inspired by another project? no

   • Did you notify the maintainers and provide attribution?

2. Is this a breaking change? no

[codecov-commenter]

Codecov Report

Merging #4192 (521679a) into main (5c9b998) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4192      +/-   ##
==========================================
+ Coverage   69.83%   69.87%   +0.03%     
==========================================
  Files         212      212              
  Lines       11623    11623              
==========================================
+ Hits         8117     8121       +4     
+ Misses       3454     3450       -4     
  Partials       52       52              

Flag	Coverage Δ
unittests	69.87% <ø> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
cmd/cli/install.go	81.34% <ø> (ø)
pkg/crdconversion/crdconversion.go	71.42% <0.00%> (+4.08%)	⬆️

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