[Docs] Document connection access control in environments

[YASHMAHAKAL]

Description

Adds a new Access Control for Connections and Credentials section to cloud/concepts/spaces/environments.md

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[gemini-code-assist]

Code Review

This pull request updates the documentation for identity, security, and environments. Specifically, it renames a list item in the identity and security concepts page and adds a new section explaining access control for connections and credentials in the environments page. The review feedback suggests improving consistency by using an em-dash instead of parentheses, using 'User ID' instead of 'UserID' for better readability, and simplifying a wordy sentence describing indirect access.

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