Fixes #23621

Part of #25740

To support TS Server plugins for languages like angular, we will allow extensions to register new langauges for TypeScript to watch. The angular language for example would want ng-html files to also be uploaded to TypeScript for checking

The current language definitions all define both a set of language modes they support and a set of file extensions. The file extension part is unnessiary and may be incorrect depending on how a user sets up their `file.associations` in the workspace. This change removes the extensions part so that we always make use of the language mode

This reverts commit b9988fed.

fixes #8851

This reverts commit f3ffc2ed.

Lua syntax extension is missing 'goto' keyword

Correct LC_ALL.  Resolves #26227

Fixes #26406

**Bug**
If there is an active selection, the on Enter rules may use the wrong language mode which results in the incorrect `afterEnterText`. See #26406 for an example of this case

**Fix**
Use language mode from the selection and  correctly compute offset when grabbing `afterEnterText`

Fixes #26351

**bug**

For the code

```js
const x = <b>|</b>;
```

with the cursor at the `|`, on enter rules should change the code to:

```js
const x = <b>
    |
</b>;
```

However we currently do not handle this case. The cause is the extra semicolon at the end of the line. This causes `getEnterAction` to think we are in a javascript context for the onenter rules instead of in a js-tags context

**fix**
Pass in the column of the cursor when getting the language id to use for the on enter rules instead of using the end of the line. This ensures we are in the `jsx-tags` language in the above case