fix: CSS path in expose-production produce double slashes

[PierreRainero]

Description

EDIT : Sorry the problem occurs since the 1.3.8 not the 1.3.7.

Since version 1.3.8 our federated CSS files are exposed by a wrong path (under double slashes).
For example, the same configurations of this plugin produce :

• 1.3.6 :

  http://domain.com/foo/assets/__federation_expose_ModuleName-xxxx.css
  

• 1.3.8 :

  http://domain.com/foo//assets/__federation_expose_ModuleName-xxxx.css
  

Additional context

The problem come from the usage of join('/') while a "base" vite can end by a slash (which is mostly the case for other plugins configurations).

The current code looks like this :

const baseUrl = '/foo/';
const assetsDir = 'assets';
const cssPath = 'myFile.css';

const href = [baseUrl, assetsDir, cssPath].filter(Boolean).join('/');
// href : "/foo//assets/myFile.css"

With the proposed update :

const baseUrl = '/foo/';
const assetsDir = 'assets';
const cssPath = 'myFile.css';

const href = [baseUrl, assetsDir, cssPath].filter(Boolean).map(part => part.endsWith('/') ? part.substring(0, part.length - 1) : part).join('/');
// href : "/foo/assets/myFile.css"

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Code of Conduct and follow the Commit Convention guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it : I didn't find where to add a related test.

[angelsantosa]

This happens to us.

ALSO this with 1.3.8

MFE: http://remote-domain.com/assets/__federation_expose_ModuleName-xxxx.css

const baseUrl = './';
const assetsDir = 'assets';
const cssPath = 'myFile.css';

const href = [baseUrl, assetsDir, cssPath].filter(Boolean).join('/');

HOST: http://domain.com/some-path Requests: http://remote-domain.com/assets/assets/__federation_expose_ModuleName-xxxx.css

EDIT: Fixed use case