[Bug-Candidate]: Ternary operators involving function types fail to be generated.

### Describe the issue:

The ternary operator `r = true ? g : f;`, which involves function types, fails to generate IR, causing Slither to crash.

### Code example to reproduce the issue:

```solidity
contract C {
function f() public {
}

function g() public {
}

function() r = true ? g : f;

}
```

### Version:

0.11.0

### Relevant log output:

```shell
ERROR:SlitherSolcParsing:
Failed to generate IR for C.slitherConstructorVariables. Please open an issue https://github.com/crytic/slither/issues.
C.slitherConstructorVariables (a.sol#1-10):
r = if true then g else f
Traceback (most recent call last):
...
slither.slithir.exceptions.SlithIRError: Ternary operator are not convertible to SlithIR if true then g else f
ERROR:root:Error:
ERROR:root:Ternary operator are not convertible to SlithIR if true then g else f
ERROR:root:Please report an issue to https://github.com/crytic/slither/issues
```

Start by reproducing the failure with the Solidity contract and the reported ternary expression, then trace the SlithIR conversion that rejects `if true then g else f`. Done means the example generates IR successfully without the reported SlithIRError or Slither crash.

Written by the indexing model from the issue text.