Add CA2024: Do not use 'StreamReader.EndOfStream' in async methods

[mpidash]

Fixes dotnet/runtime#98834.

Rule ID	CA2024
Title	Do not use 'StreamReader.EndOfStream' in async methods
Message	Do not use '{0}' in an async method
Description	The property 'StreamReader.EndOfStream' can cause unintended synchronous blocking when no data is buffered. Instead, use 'StreamReader.ReadLineAsync' directly, which returns 'null' when reaching the end of the stream.
Category	Reliability
Severity	Warning

This analyzer detects when StreamReader.EndOfStream is used in an async method, which can prevent I/O from being done asynchronously.

---

I've tested against dotnet/runtime, dotnet/roslyn and dotnet/aspnetcore and found no violations.

I've also added a reference to EndOfStream in an async method in runtime for testing, which leads to the following message: warning CA2024: Do not use 'sr.EndOfStream' in an async method.

[codecov]

Codecov Report

Attention: Patch coverage is 98.36449% with 7 lines in your changes missing coverage. Please review.

Project coverage is 96.50%. Comparing base (8d4f432) to head (9c662fc).

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #7390    +/-   ##
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  Coverage   96.50%   96.50%            
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  Files        1443     1445     +2     
  Lines      346376   346804   +428     
  Branches    11387    11393     +6     
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+ Hits       334255   334682   +427     
+ Misses       9239     9237     -2     
- Partials     2882     2885     +3