fix: adds headless ternary to handle 'new', true, and false in a non-… #1511
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…breaking fashion (#1485) (#1486)
Adapted from conversation in #1485 and @Neychok's initial PR in #1486.
Summary
Puppet and Playwright complain and pollute logs with warnings about "new headless mode". This reads the value set in backstop.json, or uses true if 'headless' is not set, or 'new', as a string. README updated with details.
Tests
Updated all
./test/configs
withheadless: 'new'
and ran sanity tests. For example:Closes: #1485