locate_tools: add detailed warnings for vcvarsall.bat errors

[Javagedes]

Adds additional logging to QueryVcVariables() when calling vcvarsall.bat. command prompt arguments are limited to 8191 characters, which includes ENV variables. On top of that, any ENV variable that exceeds 8191 characters itself is not passed to a command.

This causes two different errors when confusing:

1. When the total env is greater than 8191 characters (but a specific variable is not), the command fails with an ambigious error Exception: The input line is too long. The syntax of the command is incorrect.

2. When a specific variable is greater than 8191 characters (commonly the PATH variable), it is not passed to the command. This means that the command does not fail, however specifically for vcvarsall.bat, we might fail to find what we are searching for because the folder it resides in could set in PATH.

This commit adds the following:

1. When the PATH variable is greater than 8191 characters, a warning will notify the user that PATH will not be included when searching for their keys.
2. When an exception occurs stating that the input line is too long, we expand on the exception to provide a clear message as to why the error is occurring.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (933c6ce) 78.75% compared to head (3ea9b52) 78.79%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #320      +/-   ##
==========================================
+ Coverage   78.75%   78.79%   +0.03%     
==========================================
  Files          47       47              
  Lines        6703     6710       +7     
==========================================
+ Hits         5279     5287       +8     
+ Misses       1424     1423       -1     

Impacted Files	Coverage Δ
edk2toollib/windows/locate_tools.py	87.28% <100.00%> (+0.85%)	⬆️

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