Fix `Connection` of type `PcapSources` to `Vec<Connection>`

[kimhanbeom]

• Fix Connection of type PcapSources to Vec<Connection>. This change will allow giganto to find the latest Connection and extract pcap even if it detects a late disconnect from ingest.
• Apply the log level based on the RUST_LOG.
• Fix clippy error.

Close: #859 Close: #860

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 27.27273% with 24 lines in your changes missing coverage. Please review.

Project coverage is 76.75%. Comparing base (bb1fbf3) to head (daeb14a). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/graphql/export.rs	0.00%	14 Missing :warning:
src/main.rs	16.66%	5 Missing :warning:
src/publish.rs	0.00%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #864 +/- ## ========================================== - Coverage 76.77% 76.75% -0.02% ========================================== Files 31 31 Lines 24895 24907 +12 ========================================== + Hits 19112 19117 +5 - Misses 5783 5790 +7 ```

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