feat(telemetry): add delta temporality support for OTLP metrics

[codefromthecrypt]

What type of PR is this?
feat(telemetry): add new feature

What this PR does / why we need it:
Adds reportCountersAsDeltas and reportHistogramsAsDeltas fields to OpenTelemetry metric sink configuration for backends that require delta temporality.

Elastic OTLP endpoints require delta temporality for histograms - cumulative histograms are dropped:
https://www.elastic.co/docs/reference/opentelemetry/compatibility/limitations

The EDOT (Elastic Distribution of OpenTelemetry) SDKs default to delta temporality for this reason.

Release Notes: Yes

Example:

spec:
  telemetry:
    metrics:
      sinks:
        - type: OpenTelemetry
          openTelemetry:
            host: otel-collector.example.com
            port: 4317
            reportHistogramsAsDeltas: true
            reportCountersAsDeltas: true

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.31%. Comparing base (b9123a8) to head (963f476).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7697      +/-   ##
==========================================
+ Coverage   72.28%   72.31%   +0.02%     
==========================================
  Files         234      234              
  Lines       34480    34482       +2     
==========================================
+ Hits        24924    24934      +10     
+ Misses       7767     7760       -7     
+ Partials     1789     1788       -1     

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[codefromthecrypt]

rebased.. hope for merge on this as it helps me undraft #7674 (as this makes otel-tui example readable on metrics)

[arkodg]

LGTM thanks