UnusedPrivateMethodRule has false positives for usages done with case mismatches

[stof]

Bug report

If a private method is called with a mismatching case, UnusedPrivateMethodRule will report it as unused, while this is wrong (given PHP treats method names as case insensitive).
Worse is that the case mismatch is only reported by strict rules, so a developer trusting phpstan might remove the method (and then be granted with a missing method error on next run)

Code snippet that reproduces the problem

https://phpstan.org/r/738ba792-52e6-4e0e-8ba7-491ebc238488

Expected output

No errors should be removed (unless strict rules are enabled of course) by making UnusedPrivateMethodRule do a case insensitive check.

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No response

[ondrejmirtes]

Duplicate of #8346

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