Replace JS Bin refs by CodePen or StackBlitz references

Closes #36699 (closed)

Proposal to remove JS Bin references:

• in our Contributing page: When users create issues via GitHub, it is already proposed to Include links reduced test case links or suggested fixes using CodePen v4 template or v5 template.. Plus it will be easier to maintain rather than forgetting this hidden JS Bin in the future :)
• in our bot message linked to the 'needs-example' label: Our current documentation provides tons of examples with StackBlitz and not with JS Bin.

.github/workflows/issue-labeled.yml

@@ -16,4 +16,4 @@ jobs:
           actions: "create-comment"
           token: ${{ secrets.GITHUB_TOKEN }}
           body: |
-            Hello @${{ github.event.issue.user.login }}. Bug reports must include a **live demo** of the issue. Per our [contributing guidelines](https://github.com/twbs/bootstrap/blob/main/.github/CONTRIBUTING.md), please create a reduced test case on [CodePen](https://codepen.io/) or [JS Bin](https://jsbin.com/) and report back with your link, Bootstrap version, and specific browser and Operating System details.
+            Hello @${{ github.event.issue.user.login }}. Bug reports must include a **live demo** of the issue. Per our [contributing guidelines](https://github.com/twbs/bootstrap/blob/main/.github/CONTRIBUTING.md), please create a reduced test case on [CodePen](https://codepen.io/) or [StackBlitz](https://stackblitz.com/) and report back with your link, Bootstrap version, and specific browser and Operating System details.

.github/CONTRIBUTING.md

@@ -69,7 +69,7 @@ Guidelines for bug reports:
 
 3. **Isolate the problem** — ideally create a [reduced test
    case](https://css-tricks.com/reduced-test-cases/) and a live example.
-   [This JS Bin](https://jsbin.com/lolome/edit?html,output) is a helpful template.
+   These [v4 CodePen](https://codepen.io/team/bootstrap/pen/yLabNQL) and [v5 CodePen](https://codepen.io/team/bootstrap/pen/qBamdLj) are helpful templates.
 
 
 A good bug report shouldn't leave others needing to chase you up for more