telemetry change to get esm packages selected count

[SathishMSFT]

Adding telemetry log to get count of ESM packages selected to install.

Test:

• Ubuntu 18 Unattached.
• Ubuntu 18 Attached.

[codecov]

Codecov Report

Merging #202 (9f7efb4) into master (2e5c14b) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
+ Coverage   90.07%   90.12%   +0.04%     
==========================================
  Files          90       90              
  Lines       14423    14445      +22     
==========================================
+ Hits        12991    13018      +27     
+ Misses       1432     1427       -5     

Flag	Coverage Δ
python27	90.12% <100.00%> (+0.04%)	⬆️
python39	90.12% <100.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/core/src/core_logic/PatchAssessor.py	99.36% <100.00%> (ø)
src/core/src/core_logic/PatchInstaller.py	96.60% <100.00%> (ø)
...ore/src/package_managers/AptitudePackageManager.py	89.67% <100.00%> (+0.04%)	⬆️
src/core/src/package_managers/PackageManager.py	78.80% <100.00%> (ø)
src/core/src/package_managers/YumPackageManager.py	83.33% <100.00%> (ø)
.../core/src/package_managers/ZypperPackageManager.py	87.70% <100.00%> (ø)

... and 4 files with indirect coverage changes

[kjohn-msft]

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[rane-rajasi]

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