Instrument the CSI Server with OTel Traces

[gkrenn]

Description

Adds OTel instrumentation to the csidriver containers and links them to the webhook created span.
In addition, the singletons were replaced with init functions.

Jira

How can this be tested?

• Apply the otel secret as described in doc/otel.md.
• Apply a dynakube with cloud native and create some pods.
• Check the otel traces in your tenant.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 48.85057% with 89 lines in your changes missing coverage. Please review.

Project coverage is 57.20%. Comparing base (b6b9122) to head (48859a8).

Files	Patch %	Lines
pkg/controllers/csi/driver/server.go	0.00%	48 Missing ⚠️
...g/controllers/csi/driver/volumes/host/publisher.go	19.04%	17 Missing ⚠️
...kg/controllers/csi/driver/volumes/app/publisher.go	37.50%	10 Missing ⚠️
pkg/util/dtotel/controller_runtime/writer.go	0.00%	5 Missing ⚠️
pkg/util/dtotel/traces.go	33.33%	4 Missing ⚠️
pkg/webhook/mutation/pod/register.go	0.00%	3 Missing ⚠️
pkg/util/dtotel/controller_runtime/reader.go	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3465      +/-   ##
==========================================
- Coverage   57.28%   57.20%   -0.09%     
==========================================
  Files         344      344              
  Lines       19796    19836      +40     
==========================================
+ Hits        11340    11347       +7     
- Misses       7216     7250      +34     
+ Partials     1240     1239       -1     

Flag	Coverage Δ
unittests	57.20% <48.85%> (-0.09%)	⬇️

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