🐛 dynamicsource: fix race condition with wait and valid scheme

[joelanford]

Also decreasing 1 second poll interval to 100ms. The HasSynced check that repeats every interval simply locks mutexes and checks variables available in memory, so it is extremely fast and has low over head. This decreased the test's average time from >1000ms to ~250ms

Description

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.99%. Comparing base (9125118) to head (f21a225).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1323   +/-   ##
=======================================
  Coverage   75.99%   75.99%           
=======================================
  Files          41       41           
  Lines        2429     2429           
=======================================
  Hits         1846     1846           
  Misses        410      410           
  Partials      173      173           

Flag	Coverage Δ
e2e	58.25% <100.00%> (ø)
unit	53.02% <100.00%> (+0.28%)	⬆️

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[LalatenduMohanty]

/lgtm