[Feature] Implement a blocked servers list

[alexjustesen]

📃 Description

This PR implements a "blocked server" list. The "allow" list set in SPEEDTEST_SERVERS will take precedent over the "blocked" list set in SPEEDTEST_BLOCKED_SERVERS.

• closes [Feature] Implement a "blocked" servers list #1877

🪵 Changelog

➕ Added

• get a list of servers and filter them based on the blocked servers list.
• SPEEDTEST_BLOCKED_SERVERS environment variable, this should be a comma separated list of server IDs like SPEEDTEST_BLOCKED_SERVERS="1234,09876,15432".

🧜‍♀️ Process Map

flowchart TD
    A[Select server job] --> B{Server exists?}
    B -->|Yes| Z
    B -->|No| C{Has config servers?}
    C -->|Yes| D(Choose a random server from the list)
    D --> X(Update server)
    X --> Z
    C -->|No| E{Blocked list present?}
    E -->|No| Z
    E -->|Yes| F(Get server list and filter blocked list)
    F --> G(Pick the first server from the list)
    G --> Y(Update server)
    Y --> Z(End job)

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