Fix logging of execution attempt

[martintmk]

Details on the issue fix or feature implementation

While testing the alpha.2 I have noticed that execution attempt is being logged with warning level. This PR adds separate logging entry for execution attempt and changes the log level based on whether the result was handled or not.

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

Merging #1341 (55a5700) into main (18171df) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1341      +/-   ##
==========================================
+ Coverage   83.54%   83.58%   +0.03%     
==========================================
  Files         270      270              
  Lines        6374     6389      +15     
  Branches     1003     1008       +5     
==========================================
+ Hits         5325     5340      +15     
  Misses        840      840              
  Partials      209      209              

Flag	Coverage Δ
linux	?
macos	83.58% <100.00%> (+0.03%)	⬆️
windows	83.58% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
...s/Telemetry/ResilienceTelemetryDiagnosticSource.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes