Improve Stats Event Sequencing Documentation and Add Tests for Server-Side Events Sequencing

[RyanBlaney]

RELEASE NOTES:
Type: Documentation, Test
Improved sequencing documentation for server-side stats events and added tests to verify the event order.

Related Issue

This is in response to Issue #7824

• Documentation Clarification: Clarified the expected sequencing of stats events in the server-side stats.Handler.
• New Test Cases: Added tests to verify the event sequencing for various RPC types, ensuring consistency and accuracy in server-side stats handling.

[linux-foundation-easycla]

• ✅login: RyanBlaney / (94cbd35)

The committers listed above are authorized under a signed CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.21%. Comparing base (4c07bca) to head (94cbd35).

Files with missing lines	Patch %	Lines
stats/stats.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7883      +/-   ##
==========================================
+ Coverage   81.84%   82.21%   +0.36%     
==========================================
  Files         377      377              
  Lines       38120    38120              
==========================================
+ Hits        31201    31339     +138     
+ Misses       5603     5497     -106     
+ Partials     1316     1284      -32     

Files with missing lines	Coverage Δ
stats/stats.go	68.42% <50.00%> (ø)

... and 24 files with indirect coverage changes