Fix broken link of Mesh dashboard services

[carolynhu]

Please provide a description for what this PR is for. #29138

Tthe link is pointing to corresponding service now.

https://snapshot.raintank.io/dashboard/snapshot/q7nLFxxgm3KVd4zpxrr16DzrLTzRYlWF

[ ] Configuration Infrastructure
[ ] Docs
[ ] Installation
[ ] Networking
[ ] Performance and Scalability
[ x] Policies and Telemetry
[ ] Security
[ ] Test and Release
[x ] User Experience
[ ] Developer Infrastructure

Pull Request Attributes

Please check any characteristics that apply to this pull request.

[ ] Does not have any changes that may affect Istio users.

[carolynhu]

/retest

[istio-testing]

In response to a cherrypick label: #29237 failed to apply on top of branch "release-1.8":

Applying: Fix broken link of Mesh dashboard services
Using index info to reconstruct a base tree...
M	manifests/addons/dashboards/istio-mesh-dashboard.json
M	samples/addons/grafana.yaml
Falling back to patching base and 3-way merge...
Auto-merging samples/addons/grafana.yaml
CONFLICT (content): Merge conflict in samples/addons/grafana.yaml
Auto-merging manifests/addons/dashboards/istio-mesh-dashboard.json
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Fix broken link of Mesh dashboard services
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

[istio-testing]

In response to a cherrypick label: new issue created for failed cherrypick: #29241