chore: collect stats for reporting event sampler

[vamsikrishnakandi]

Description

collect stats for reporting event sampler

Linear Ticket

Part of OBS-461

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.87%. Comparing base (446666b) to head (1107e09).

Files with missing lines	Patch %	Lines
...nterprise/reporting/event_sampler/event_sampler.go	66.66%	1 Missing ⚠️
enterprise/reporting/reporting.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5357      +/-   ##
==========================================
+ Coverage   74.81%   74.87%   +0.06%     
==========================================
  Files         437      438       +1     
  Lines       61230    61266      +36     
==========================================
+ Hits        45807    45873      +66     
+ Misses      12894    12860      -34     
- Partials     2529     2533       +4     

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