Add synthetic example with UUID and generic token

Katrin Leinweberrequested to merge
test-uuid-and-generic-token-in-erb-ajax-script into master

This example is based off of an internal customer report about our secrets analyzer not picking up such tokens (see jobs/3139899051), while gitleaks itself does:

$ gitleaks version && 
  gitleaks detect --verbose --no-banner | 
  grep --context=2 'y67DGjkkjiu6644eDfycUGhu'
8.13.0
Fingerprint: b621b4d9fb51692a1bf47fdd64ba3a0e3e965f35:subdir/example.erb:generic-api-key:5

Finding:     'Client':'y67DGjkkjiu6644eDfycUGhu'
Secret:      y67DGjkkjiu6644eDfycUGhu
RuleID:      generic-api-key
Entropy:     3.803509
5:33AM INF scan completed in 119ms
5:33AM WRN leaks found: 163

Our anaylzer is 1 minor version behind, but checking gitleaks@master $ git diff v8.12.0..v8.13.0 -- config/gitleaks.toml doesn't reveal any obviously relevant changes, so this seems to be a more fundamental problem.

Edited by Katrin Leinweber

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