Improve AppInsights setup

[Porges]

Switch to using the package provided by Azure Functions to set up Application Insights.

Using the provided setup method AddApplicationInsightsTelemetry will configure the dependency collector by default as well as set up some other things that we haven’t done manually, including application version, which would be very useful.

This also means that operation_Id is populated more consistently which permits joining traces or dependencies on the requests table.

This also means that the end-to-end data in AI is now correct, so the chart works:

[codecov-commenter]

Codecov Report

Merging #2597 (22cb201) into main (22cb201) will not change coverage.
The diff coverage is n/a.

❗ Current head 22cb201 differs from pull request most recent head 74f51aa. Consider uploading reports for the commit 74f51aa to get more accurate results

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##             main    #2597   +/-   ##
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  Coverage   29.85%   29.85%           
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  Files         289      289           
  Lines       35809    35809           
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  Hits        10692    10692           
  Misses      25117    25117           

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