Getting the agent version from the version file

[dhivyaganesan]

One of the test used the agent dev version. Updating it to use the agent version from version file
Issue #

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• New Unit tests were added for the changes made

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[codecov]

Codecov Report

Merging #2346 (c871f8f) into develop (66cc4dd) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2346      +/-   ##
===========================================
- Coverage    70.89%   70.87%   -0.03%     
===========================================
  Files           97       97              
  Lines        14107    14107              
  Branches      2029     2029              
===========================================
- Hits         10001     9998       -3     
- Misses        3661     3662       +1     
- Partials       445      447       +2     

Impacted Files	Coverage Δ
azurelinuxagent/ga/collect_telemetry_events.py	89.72% <0.00%> (-1.03%)	⬇️

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