test: address 4 E2E test flakes

[jackfrancis]

Reason for Change:

1. validate service URLs w/ retries
2. don’t enforce “shell out command” timeouts everywhere
3. standardize Linux stability tests timeout to 3 secs per test
4. standardize some Windows stability tests timeout to 1 minute per test

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[acs-bot]

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[codecov]

Codecov Report

Merging #1997 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1997   +/-   ##
=======================================
  Coverage   76.72%   76.72%           
=======================================
  Files         135      135           
  Lines       20562    20562           
=======================================
  Hits        15776    15776           
  Misses       3871     3871           
  Partials      915      915