[STATS-2239]: Update Fastly-exporter with new fields (and remove vcl_on_compute)

[drrev]

Summary

This PR makes the following changes to synchronize with the latest schema:

• RT:
  • Added:
    • bot_challenges_verification_api_duplicate_count
    • bot_challenges_verification_api_expired_count
    • bot_challenges_verification_api_failure_count
    • bot_challenges_verification_api_success_count
    • compute_cache_operations_count
    • ddos_protection_requests_allow_count
    • ddos_protection_requests_detect_count
    • ddos_protection_requests_mitigate_count
    • object_storage_class_a_operations_count
    • object_storage_class_b_operations_count
    • request_collapse_unusable_count
    • request_collapse_usable_count
    • request_denied_get_head_body
    • status_530
  • Removed:
    • vcl_on_compute_edge_hit_requests_total
    • vcl_on_compute_edge_miss_requests_total
    • vcl_on_compute_error_requests_total
    • vcl_on_compute_hit_requests_total
    • vcl_on_compute_miss_requests_total
    • vcl_on_compute_pass_requests_total
    • vcl_on_compute_synth_requests_total
• Origins:
  • Added:
    • compute_status_530
    • status_530
    • waf_status_530
• Domains:
  • Added:
    • origin_status_530
    • status_530

Known Issues

• No API doc exists for the new bot_challenges_* metrics, so the associated help is empty.

[SuperQ]

FYI, _count is not a valid metric suffix for counter metrics. They should end in _total.