Add a dev suite for playing with scratch

[Shaumik-Ashraf]

Summary

This could be useful for debugging one day

Testing Guidance

1. checkout branch
2. bundle exec inferno services start
3. inferno start
4. Go to http://127.0.0.1:4567/inferno and select Scratch suite.

[codecov]

Codecov Report

Attention: Patch coverage is 77.41935% with 7 lines in your changes missing coverage. Please review.

Project coverage is 84.03%. Comparing base (88bc16c) to head (75eea1b).

Files with missing lines	Patch %	Lines
dev_suites/dev_scratch/scratch_suite.rb	77.41%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #549      +/-   ##
==========================================
- Coverage   84.05%   84.03%   -0.02%     
==========================================
  Files         262      263       +1     
  Lines       11415    11446      +31     
  Branches     1256     1256              
==========================================
+ Hits         9595     9619      +24     
- Misses       1810     1817       +7     
  Partials       10       10              

Flag	Coverage Δ
backend	92.06% <77.41%> (-0.11%)	⬇️
frontend	79.31% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[Shaumik-Ashraf]

This suite doesn't expose any new properties or bugs in scratch, so closing