deps(instrumentation-http): move sdk-metrics to dev dependencies

[pichlermarc]

Which problem is this PR solving?

@opentelemetry/instrumentation-http currently depends on @opentelemetry/sdk-metrics, this is not necessary, as it does not use anything from the SDK outside of the tests.

Short description of the changes

Moves @opentelemetry/sdk-metrics to devDependencies.

Type of change

• dependencies

How Has This Been Tested?

• Existing tests

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

Merging #3380 (a93c6f4) into main (1536a7c) will increase coverage by 0.41%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3380      +/-   ##
==========================================
+ Coverage   92.83%   93.25%   +0.41%     
==========================================
  Files         232      247      +15     
  Lines        6605     7341     +736     
  Branches     1362     1509     +147     
==========================================
+ Hits         6132     6846     +714     
- Misses        473      495      +22     

Impacted Files	Coverage Δ
...emetry-instrumentation-xml-http-request/src/xhr.ts	97.58% <0.00%> (ø)
...entelemetry-sdk-trace-web/src/WebTracerProvider.ts	100.00% <0.00%> (ø)
...ckages/opentelemetry-sdk-trace-web/karma.worker.js	100.00% <0.00%> (ø)
...mentation-xml-http-request/src/enums/EventNames.ts	100.00% <0.00%> (ø)
...s/opentelemetry-instrumentation-fetch/src/fetch.ts	97.02% <0.00%> (ø)
...es/opentelemetry-context-zone-peer-dep/src/util.ts	100.00% <0.00%> (ø)
...-instrumentation-fetch/src/enums/AttributeNames.ts	100.00% <0.00%> (ø)
packages/opentelemetry-sdk-trace-web/src/types.ts	100.00% <0.00%> (ø)
...ntelemetry-resources/src/detectors/NoopDetector.ts	100.00% <0.00%> (ø)
...ation-xml-http-request/src/enums/AttributeNames.ts	100.00% <0.00%> (ø)
... and 11 more