Reserve keywords and remove identifier exceptions for 0.9.0

In this release cycle we had to introduce a bunch parser hacks to avoid breaking existing code:
- In order to introduce new Yul opcodes in a non-breaking way, we had to mark them as exceptions for older EVM versions [in `createReservedIdentifiers()`](https://github.com/ethereum/solidity/blob/v0.8.27/libyul/backends/evm/EVMDialect.cpp#L159-L167):
- `basefee`
- `prevrandao`
- `tstore`
- `tload`
- `blobbasefee`
- `blobhash`
- `mcopy`
- `clz`
- `slotnum`
- Existing builtins have not been made reserved yet
- `memoryguard`
- New keywords needed for storage layout syntax (#597):
- `at`
- `layout`
- New keywords needed for transient storage (#15007)
- `transient`
- Other identifiers that should become keywords:
- `error`
- `super`
- `this`
- `leave` (in Yul)

In the next breaking release the exceptions should be removed and keywords added.

Start in libyul/backends/evm/EVMDialect.cpp at createReservedIdentifiers(), where several identifiers are currently exceptions for older EVM versions. Trace the parser and keyword handling for the listed Yul opcodes and Solidity identifiers, then remove the exceptions and reserve the requested keywords for the 0.9.0 breaking release. Done means the listed names are treated consistently as reserved keywords without preserving the old identifier exceptions.

Written by the indexing model from the issue text.