Switch to use edk2-pytool-library UefiVariableSupportLib.

[apop5]

Description

There are multiple copies of VariableSupportLib floating across repos, mostly only supporting Windows.
Functionality has been consolidated into edk2-pytool-library version 0.21.7. Support for Linux has been added.

Switch ReadUefiVarsToConfVarList.py, PyRobotRemote.py, WrapAndSetSvd.py and WriteConfVarListToUefiVars.py to use consolidated version from edk2-pytool-library.

Removed local copies of VariableSupportLib.py

For each item, place an "x" in between [ and ] if true. Example: [x].
(you can also check items in the GitHub UI)

• Impacts functionality?
  • Functionality - Does the change ultimately impact how firmware functions?
  • Examples: Add a new library, publish a new PPI, update an algorithm, ...
• Impacts security?
  • Security - Does the change have a direct security impact on an application,
    flow, or firmware?
  • Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
• Breaking change?
  • Breaking change - Will anyone consuming this change experience a break
    in build or boot behavior?
  • Examples: Add a new library class, move a module to a different repo, call
    a function in a new library class in a pre-existing module, ...
• Includes tests?
  • Tests - Does the change include any explicit test code?
  • Examples: Unit tests, integration tests, robot tests, ...
• Includes documentation?
  • Documentation - Does the change contain explicit documentation additions
    outside direct code modifications (and comments)?
  • Examples: Update readme file, add feature readme file, link to documentation
    on an a separate Web page, ...

How This Was Tested

Integration Instructions

N/A

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 36.24%. Comparing base (7a3ae63) to head (eac7498).

❗ Current head eac7498 differs from pull request most recent head 314c7f7

Please upload reports for the commit 314c7f7 to get more accurate results.

Files	Patch %	Lines
SetupDataPkg/Tools/WrapAndSetSvd.py	0.00%	2 Missing ⚠️
SetupDataPkg/Tools/ReadUefiVarsToConfVarList.py	0.00%	1 Missing ⚠️
SetupDataPkg/Tools/WriteConfVarListToUefiVars.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #362      +/-   ##
==========================================
+ Coverage   36.22%   36.24%   +0.02%     
==========================================
  Files          31       31              
  Lines        6258     6254       -4     
  Branches      449      449              
==========================================
  Hits         2267     2267              
+ Misses       3989     3985       -4     
  Partials        2        2              

Flag	Coverage Δ
Linux	27.58% <0.00%> (+0.02%)	⬆️

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