Fold TEnumTraits GetMinValue/GetMaxValue to compile time

GetMinValue()/GetMaxValue() are constexpr, but when called from a runtime
context for a large-domain enum, clang does not fold the min/max_element and
emits a runtime scan over the whole domain on every call. This is hot on the
master replay path: TEnumIndexedArray::operator[] bounds-checks against these
(e.g. TCypressManager::FindHandler), and TCompositeAutomaton::RememberReign
hits GetCurrentReign() = GetMaxValue() over the ~3300-entry EMasterReign domain
per mutation.

Bind the result to a constexpr local to force compile-time evaluation. Verified
by disasm on a 240-value sample enum: getmin() goes from a ~44-instruction
runtime scan to a single 'mov $const'. No behavior change.

Part of YT-28453 (master replay-speed optimizations).
commit_hash:7cdb969e00ba219415d80c5c8c984aa8bbde99d2

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