Removed PackSqlServer from BuildAllConfigurations target

[paulmedynski]

Description

I mistakenly added the PackSqlServer target to BuildAllConfigurations a few commits ago. It was polluting the signing verification steps of our OneBranch Official pipeline. I cleaned up these targets a bit and tested them on the command line. I'm running an Official pipeline to confirm.

[Copilot]

Pull request overview

Removes PackSqlServer from the top-level BuildAllConfigurations target in build.proj to avoid generating extra packages during “build all configurations” runs (notably in official pipeline signing/verification scenarios), and updates build docs accordingly.

Changes:

• Add a new BuildSqlClient target and simplify BuildAllConfigurations dependencies (dropping PackSqlServer).
• Update BUILDGUIDE.md examples to use the updated target flow (including BuildSqlClient).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
build.proj	Removes PackSqlServer from BuildAllConfigurations and introduces BuildSqlClient target.
BUILDGUIDE.md	Updates “Package references” build command examples to reflect new/cleaned targets.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.09%. Comparing base (a561ed3) to head (5c035ce).
⚠️ Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (a561ed3) and HEAD (5c035ce). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (a561ed3)	HEAD (5c035ce)
CI-SqlClient	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3991      +/-   ##
==========================================
- Coverage   72.54%   67.09%   -5.46%     
==========================================
  Files         287      282       -5     
  Lines       43149    67171   +24022     
==========================================
+ Hits        31303    45068   +13765     
- Misses      11846    22103   +10257     

Flag	Coverage Δ
CI-SqlClient	?
PR-SqlClient-Project	67.09% <ø> (?)

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