chore: remove deprecated request functionality

[stijnmoreels]

Remove deprecated functionality related to request tracking in preperation to the v3 release.

Closes #404
Closes #397

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Name	Link
🔨 Latest commit	b5410a9
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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (14e17ad) 85.71% compared to head (b5410a9) 85.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #543      +/-   ##
==========================================
- Coverage   85.71%   85.58%   -0.14%     
==========================================
  Files          71       71              
  Lines        3095     2955     -140     
  Branches      217      194      -23     
==========================================
- Hits         2653     2529     -124     
- Misses        365      366       +1     
+ Partials       77       60      -17     

Files	Coverage Δ
....AspNetCore/Extensions/ILoggerRequestExtensions.cs	88.57% <ø> (+19.34%)	⬆️
...emetry.Core/Extensions/ILoggerRequestExtensions.cs	94.02% <100.00%> (+23.19%)	⬆️
...vability.Telemetry.Core/Logging/RequestLogEntry.cs	97.29% <ø> (+2.05%)	⬆️
...onInsights/Converters/RequestTelemetryConverter.cs	4.22% <ø> (-56.02%)	⬇️

... and 3 files with indirect coverage changes

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[fgheysels]

It looks like we're using some obsolete 'LogMetric' and other obsolete Log Dependency methods here. We should replace them by the non-obsolete methods

[stijnmoreels]

It looks like we're using some obsolete 'LogMetric' and other obsolete Log Dependency methods here. We should replace them by the non-obsolete methods

All in good time #398, #404, #401, #424, #428... it was too big to remove all in a single PR, that's why this PR only handles the deprecated request-related functionality.