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, 3 insertions, 3 deletions

diff --git a/ext/node/polyfills/_zlib_binding.mjs b/ext/node/polyfills/_zlib_binding.mjs
index 0286fefd5..11ccd6b91 100644
--- a/ext/node/polyfills/_zlib_binding.mjs
+++ b/ext/node/polyfills/_zlib_binding.mjs
@@ -4,9 +4,9 @@
 
 // deno-lint-ignore-file
 
-import assert from "internal:deno_node/polyfills/assert.ts";
-import { constants, zlib_deflate, zlib_inflate, Zstream } from "internal:deno_node/polyfills/_pako.mjs";
-import { nextTick } from "internal:deno_node/polyfills/_next_tick.ts";
+import assert from "internal:deno_node/assert.ts";
+import { constants, zlib_deflate, zlib_inflate, Zstream } from "internal:deno_node/_pako.mjs";
+import { nextTick } from "internal:deno_node/_next_tick.ts";
 
 export const Z_NO_FLUSH = constants.Z_NO_FLUSH;
 export const Z_PARTIAL_FLUSH = constants.Z_PARTIAL_FLUSH;