Add test_suite_scripts folder and WSL2 quickstart guides

[gitwjr]

Adds a test_suite_scripts folder containing automation scripts and guides for
building the Test Suite on Windows with WSL2, and updates the README Tip to
point WSL2 users at the QuickStart Guide.

This is the real version of what was attached to #148 as comments. The scripts
and guides have been updated since then: the folder and filenames no longer
contain spaces, the test suite version is now parameterized rather than
hardcoded, and a bug in the script's copy step has been fixed.

WAVE_WSL_QuickStart_Guide.md is the entry point; it cross-references
WAVE_WSL_User_Guide.md for detailed and clean-install instructions.
test_suite_scripts/README.md renders as the folder landing page. The remaining
markdown files are displayed to the user by the scripts during testing.

The test_suite_scripts folder sits at the repo root because the build scripts expect to find it
there after the clone.

The Tip no longer links Final_Instructions_WSL2_20241220.md directly. That
document predates these scripts and covers Linux/WSL in more depth than the
automated path needs. It remains linked from WAVE_WSL_User_Guide.md, and
nothing is moved or removed by this PR.

This also removes the README's only direct link to
doc/Install-Instructions-Windows-with-WSL2.pdf. That file is untouched, and I
verified its instruction videos remain reachable and playable via
Final_Instructions_WSL2_20241220.md.

One question: the guides instruct users to clone the default branch, so this
folder only reaches them once staging is merged to master. Is there a
timeline for that merge?