In src/script/script.h:216 we define MAX_OPCODE to denote the maximum opcode that can be used in script.
However, after the addition of the OP_CHECKSIGADD with taproot in the opcode set, the MAX_OPCODE naming looks somehow misleading.
Renaming the variable to MAX_SCRIPT_OPCODE clearly denotes that the variable is intended for and referring exclusively to script (and not tapscript).