refactor(core): include_js_files! 'dir' option doesn't change specifiers (#18019)

This commit changes "include_js_files!" macro from "deno_core"
in a way that "dir" option doesn't cause specifiers to be rewritten 
to include it.

Example:
```
include_js_files! {
  dir "js",
  "hello.js",
}
```

The above definition required embedders to use:
`import ... from "internal:<ext_name>/js/hello.js"`. 
But with this change, the "js" directory in which the files are stored
is an implementation detail, which for embedders results in: 
`import ... from "internal:<ext_name>/hello.js"`.

The directory the files are stored in, is an implementation detail and 
in some cases might result in a significant size difference for the 
snapshot. As an example, in "deno_node" extension, we store the 
source code in "polyfills" directory; which resulted in each specifier 
to look like "internal:deno_node/polyfills/<module_name>", but with 
this change it's "internal:deno_node/<module_name>". 

Given that "deno_node" has over 100 files, many of them having 
several import specifiers to the same extension, this change removes
10 characters from each import specifier.

1 files changed, 2 insertions, 2 deletions

diff --git a/runtime/js/11_workers.js b/runtime/js/11_workers.js
index 7b5090dc5..32994e707 100644
--- a/runtime/js/11_workers.js
+++ b/runtime/js/11_workers.js
@@ -14,8 +14,8 @@ const {
 import * as webidl from "internal:deno_webidl/00_webidl.js";
 import { URL } from "internal:deno_url/00_url.js";
 import { getLocationHref } from "internal:deno_web/12_location.js";
-import { serializePermissions } from "internal:runtime/js/10_permissions.js";
-import { log } from "internal:runtime/js/06_util.js";
+import { serializePermissions } from "internal:runtime/10_permissions.js";
+import { log } from "internal:runtime/06_util.js";
 import {
   defineEventHandler,
   ErrorEvent,