Allow an environment variable to set the session cookie path

[joelpittet]

Description

In production we hang the app off a sub directory, and in local development it's not off a sub directory but a custom domain snipeit.test for example.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

We have a diff where against the latest stable release that gets applied and we use this in production.

Test Configuration:

• PHP version: 8.1
• MySQL version: 8.0
• Webserver version: Apache 2.4
• OS version: Ubuntu/macOS

[what-the-diff]

PR Summary

• Configurable Session Cookie Path
  The session cookie path can now be easily customized using the SESSION_COOKIE_PATH environment variable.