ci: tracking issue for missing integration tests

[chrisguida]

There are currently 14 plugins missing integration tests. It is difficult to know whether plugins are still maintained unless they have at least basic integration tests.

• ci: add missing integration tests for btcli4j #601
• ci: add missing integration tests for event-websocket #602
• ci: add missing integration tests for go-lnmetrics.reporter #603
• ci: add missing integration tests for graphql #604
• ci: add missing integration tests for invoice-queue #605
• ci: add missing integration tests for lightning-qt #606
• ci: add missing integration tests for nloop #607
• ci: add missing integration tests for poncho #608
• ci: add missing integration tests for pruning #609
• ci: add missing integration tests for sauron #610
• ci: add missing integration tests for sitzprobe #611
• ci: add missing integration tests for trustedcoin #612
• ci: add missing integration tests for watchtower-client #613
• ci: add missing integration tests for webhook #614