fix(previewer): improve binary mime type check (#3083)

* fix(previewer): improve binary mime type check

Problem: mime type for a ts/js file can either return `text/plain` or
`application/javascript` based on the contents of the file.
Previously, this meant `application/javascript` would be considered
"possibly binary". This, in conjunction with how `vim.filetype.match`
does not give a result for a filename that ends in `.ts`, would lead to
a typescript file taking the path of `check_mime_type` and eventually
`mime_hook`.

Solution: Include `application/javascript` as a non-binary file type
during mime type check.

* [docgen] Update doc/telescope.txt
skip-checks: true

---------

Co-authored-by: Github Actions <actions@github>
(cherry picked from commit fac83a556e)

doc/telescope.txt

@@ -2296,9 +2296,9 @@ utils.transform_path({opts}, {path})        *telescope.utils.transform_path()*
 
 
     Parameters: ~
-        {opts} (table)    The opts the users passed into the picker. Might
-                          contains a path_display key
-        {path} (string?)  The path that should be formatted
+        {opts} (table)       The opts the users passed into the picker. Might
+                             contains a path_display key
+        {path} (string|nil)  The path that should be formatted
 
     Return: ~
         string: The transformed path ready to be displayed