feat(telemetry): set otel service instance key id

[mazzy89]

At the moment the OpenTelemetry ServiceInstanceKeyID is hardcoded. In the case of running multiple nodes (see the upcoming case of test4 multinode), we would want to distinguish the different instances. The ServiceInstanceKeyID is meant for that https://github.com/open-telemetry/opentelemetry-go/blob/5661ff0ded32cf1b83f1147dae96ca403c198504/semconv/v1.12.0/resource.go#L941

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.68%. Comparing base (49fab4a) to head (dd21c44).

Files	Patch %	Lines
tm2/pkg/telemetry/metrics/metrics.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2435      +/-   ##
==========================================
+ Coverage   54.67%   54.68%   +0.01%     
==========================================
  Files         583      583              
  Lines       78502    78503       +1     
==========================================
+ Hits        42923    42933      +10     
+ Misses      32371    32365       -6     
+ Partials     3208     3205       -3     

Flag	Coverage Δ
contribs/gnodev	23.81% <ø> (ø)
contribs/gnofaucet	15.31% <ø> (ø)
contribs/gnokeykc	0.00% <ø> (ø)
contribs/gnomd	0.00% <ø> (ø)
gno.land	62.54% <ø> (ø)
tm2	54.38% <83.33%> (+0.10%)	⬆️

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[zivkovicmilos]

Thank you for the fix 🙏