🩹 [Patch]: Add new personal access tokens for organization and user account

[MariusStorhaug]

Description

This pull request includes updates to the 'CI' and 'workflow' workflow config, environment variables, and documentation to allow it to handle two Fine-grained access tokens.

Updates to 'CI' and 'workflow' workflow configuration:

• .github/workflows/CI.yml: Updated descriptions for APIKey, TEST_APP_CLIENT_ID, TEST_APP_PRIVATE_KEY, and TEST_PAT. Added new secrets TEST_FG_ORG_PAT and TEST_FG_USER_PAT for fine-grained personal access tokens with org and user account access respectively.
• .github/workflows/CI.yml: Updated environment variables to include TEST_FG_ORG_PAT and TEST_FG_USER_PAT.

Documentation updates:

• README.md: Updated descriptions for TEST_APP_CLIENT_ID, TEST_APP_PRIVATE_KEY, TEST_FG_ORG_PAT, TEST_FG_USER_PAT, and TEST_PAT to reflect changes in the workflow configuration.

Test updates:

• tests/tests/PSModuleTest.Tests.ps1: Updated the list of environment variables to include TEST_FG_ORG_PAT and TEST_FG_USER_PAT.

Type of change

• 📖 [Docs]
• 🪲 [Fix]
• 🩹 [Patch]
• ⚠️ [Security fix]
• 🚀 [Feature]
• 🌟 [Breaking change]

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas