Gatsby is not running the script again on route changes, causing problems when using the same function name in multiple scripts.

[Porush]

Preliminary Checks

• This issue is not a duplicate. Before opening a new issue, please search existing issues: https://github.com/gatsbyjs/gatsby/issues
• This issue is not a question, feature request, RFC, or anything other than a bug report directly related to Gatsby. Please post those things in GitHub Discussions: https://github.com/gatsbyjs/gatsby/discussions

Description

Hi, My website has multiple pages, and every page uses a different script. Every script has a single method with the same name. Now when I navigate from one page to another and call the method, it calls the method from the previous page's script. It works fine after reloading the page.

Reproduction Link

Gatsby v5 not supported by CodeSandbox or StackBlitz

Steps to Reproduce

1. Create two or three pages along with their scripts.
2. Add a console.log function with same name in all scripts.
3. Navigate to all pages one by one, you will see different logs.
4. Now navigate to another page and you will see that its still using function from last loaded script.

Expected Result

Print the log from the navigated page's script.

Actual Result

Printing log from the last newly loaded page's script.

Environment

System:
    OS: Windows 10 10.0.22621
    CPU: (16) x64 Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz
  Binaries:
    Node: 18.17.1 - D:\Program Files\nodejs\node.EXE
    Yarn: 1.22.19 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 8.3.1 - D:\Program Files\nodejs\npm.CMD
  Languages:
    Python: 3.11.4
  Browsers:
    Edge: Spartan (44.22621.2134.0), Chromium (115.0.1901.200)
  npmPackages:
    gatsby: ^5.10.0 => 5.10.0
    gatsby-plugin-advanced-sitemap: ^2.1.0 => 2.1.0
    gatsby-plugin-dark-mode: ^1.1.2 => 1.1.2
    gatsby-plugin-git-lastmod: ^0.1.2 => 0.1.2
    gatsby-plugin-image: ^3.9.0 => 3.9.0
    gatsby-plugin-load-script: ^1.1.0 => 1.1.0
    gatsby-plugin-manifest: ^5.9.0 => 5.9.0
    gatsby-plugin-postcss: ^6.10.0 => 6.10.0
    gatsby-plugin-preact: ^7.10.0 => 7.10.0
    gatsby-plugin-react-head: ^1.1.0 => 1.1.0
    gatsby-plugin-sharp: ^5.9.0 => 5.9.0
    gatsby-plugin-sitemap: ^6.10.0 => 6.10.0
    gatsby-source-filesystem: ^5.10.0 => 5.10.0
    gatsby-transformer-gitinfo: ^1.1.0 => 1.1.0
    gatsby-transformer-sharp: ^5.9.0 => 5.9.0
  npmGlobalPackages:
    gatsby-cli: 5.10.0

Config Flags

No response