feat: add pagination support when fetching repository environments

[Sylfwood]

Fixes #278

Fetching environments was limited to 30 environments. This change use pagination to support fetching all environments.

Example:

A repository with 35 environments:

Before

Only 30 environments were fetched by the extension.

After

All 35 environments are correctly fetched.

[Sylfwood]

Hello @elbrenn @AnthonyZavala If you have any chance to review this PR (it's a small change), it would help improve our operations and would be greatly appreciated.