fix(grafana): update grafana version in dashboards

[jaellio]

Description:

Updates remaining Grafana version references from 7.0.1 to 8.2.2.

Part of #4282

Testing done:

Verified dashboards functioned as expected while running automated demo,

Affected area:

Functional Area
New Functionality	[ ]
CI System	[ ]
CLI Tool	[ ]
Certificate Management	[ ]
Control Plane	[ ]
Demo	[ ]
Documentation	[ ]
Egress	[ ]
Ingress	[ ]
Install	[ ]
Networking	[ ]
Observability	[ x ]
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 #4337 (64c4fec) into main (2ce701c) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4337      +/-   ##
==========================================
+ Coverage   69.14%   69.18%   +0.03%     
==========================================
  Files         212      212              
  Lines       14470    14461       -9     
==========================================
- Hits        10006    10005       -1     
+ Misses       4413     4404       -9     
- Partials       51       52       +1     

Flag	Coverage Δ
unittests	69.18% <ø> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
pkg/k8s/util.go	96.22% <0.00%> (-0.70%)	⬇️
pkg/envoy/lds/listener.go	87.70% <0.00%> (+0.20%)	⬆️
pkg/envoy/lds/inmesh.go	79.75% <0.00%> (+1.53%)	⬆️
pkg/messaging/workqueue.go	100.00% <0.00%> (+10.71%)	⬆️

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