Fix stack trace highlight for PHP

Merged Vitali Tatarintev requested to merge 121714-fix-sentry-stack-trace-highlight-for-php into master

What does this MR do?

Pick a first alternative language for Sentry stack trace highlight, when Rouge can't decide which lexer to choose.

Fixes #121714 (closed)



Does this MR meet the acceptance criteria?


Availability and Testing


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