False negative for param-type-mismatch when using a variable as argument

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

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Type Checking

### Expected Behaviour

```lua
---@class (exact) Foo
---@field FooField integer
local Foo

---@param FooParam Foo
local function test(FooParam) end

local x = {z = 1}
test(x)

test({z = 1})
```

In the example above, Lua LS should report a param-type-mismatch diagnostic for `test(x)`. It has enough information to know that x cannot be of type Foo, at the very least because it is missing `FooField`.
We see that test({z=1}) correctly reports the param-type-mismatch diagnostic.

### Actual Behaviour

No error is reported.

### Reproduction steps

In any editor with Lua LS installed, write the provided code. Observe that there are no squiggles reported.

### Additional Notes

I would say this is a pretty serious bug. I would have expected Lua LS's type checking to be robust enough to handle checking the types of variables. It seems that all it is doing is checking that the type is a table.

IS this because there is no narrowing of variables once they become tables? This is only done for table literals?

### Log File

_No response_

Inizia con la riproduzione Lua fornita in Lua LS e segui il percorso del controllo dei tipi per il parametro passato a test, confrontando l'argomento variabile con il literal di tabella. Il lavoro è completato quando viene riportata la stessa diagnostica param-type-mismatch per test(x), incluso il caso di FooField mancante.

Scritto dal modello di indicizzazione a partire dal testo della issue.