Lua Language Server Fails to Infer Type When Passing Multiple Return Values to Generic Function

Dieses Issue hat noch niemand übernommen.

### How are you using the lua-language-server?

NeoVim

### Which OS are you using?

MacOS

### What is the issue affecting?

Type Checking

### Expected Behaviour

```lua
---@return integer
---@return string
local f = function()
return 1, "a"
end

---@generic T
---@generic U
---@param t T
---@param u U
---@return U
local g = function(t, u)
return u
end

local x = g(f())

```

When the function g is called with the multiple return values of f, the Lua Language Server should infer the type of x based on the second return value of f (string), corresponding to the second generic type parameter (U) in g.

### Actual Behaviour

The Lua Language Server fails to infer the type of x. Instead, the type is left unknown.

### Reproduction steps

1. Write the following Lua code in an editor with the Lua Language Server enabled:
```lua
---@return integer
---@return string
local f = function()
return 1, "a"
end

---@generic T
---@generic U
---@param t T
---@param u U
---@return U
local g = function(t, u)
return u
end

local x = g(f())
```
2. Observe the type inference for x.
3. Note that the type of x is not inferred as string as expected.

### Additional Notes

_No response_

### Log File

_No response_

Beginne damit, das Lua-Snippet in NeoVim bei aktiviertem Lua Language Server zu reproduzieren, und untersuche den Pfad der generischen Typinferenz für Aufrufe, die mehrere Rückgabewerte empfangen. Als erledigt gilt, dass für die Variable x string inferiert wird, passend zum zweiten Rückgabewert von f und zum generischen Parameter U.

Vom Indexierungsmodell aus dem Issue-Text verfasst.