fix: Use correct metric instance when reporting PipelineMessagesProcessed

[lenny-goodell]

fixes #1196

Signed-off-by: Leonard Goodell [email protected]

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?) N/A
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?) N/A
  

Testing Instructions

Run non-secure EdgeX stack with Device Virtual
Build and run app template locally with only PipelineMessagesProcessed enabled.
Run ASC with metrics-influxdb profile locally with DEBUG logging.

./app-service-configurable -p metrics-influxdb | grep "Transformed Metric"

Verify the PipelineMessagesProcessed is a simple counter metric rather than a timer metric

'PipelineMessagesProcessed,service=new-app-service,pipeline=default-pipeline counter-count=152 1666637357546351500\n'

New Dependency Instructions (If applicable)

[codecov-commenter]

Codecov Report

Merging #1197 (19b2b0a) into main (b219f0d) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1197   +/-   ##
=======================================
  Coverage   66.71%   66.71%           
=======================================
  Files          39       39           
  Lines        3302     3302           
=======================================
  Hits         2203     2203           
  Misses        953      953           
  Partials      146      146           

Impacted Files	Coverage Δ
internal/runtime/runtime.go	80.08% <100.00%> (ø)

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