Remove FF_GLAS_ENABLE_PHP_SUPPORT feature flag and docs

What does this MR do and why?

Remove FF_GLAS_ENABLE_PHP_SUPPORT feature flag and docs

References

[Feature flag] Cleanup FF_GLAS_ENABLE_PHP_SUPPORT (#556849 - closed) • Adam Cohen • 18.4

Related to #556849 (closed)

Edited by Adam Cohen

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