feat: //githubstats:query: add last_non_success_at column to top command

[basvandijk]

This add the last non success at column to the top command
allowing for quick filtering based on when the last failure occurred:

$ bazel run //ci/githubstats:query -- top 10 flaky% --week
...
┍━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━━━━━┯━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┑
│    │ label                                                                            │   total │     last non success at │   non_success │   flaky │   timeout │   fail │   non_success% │   flaky% │   timeout% │   fail% │   impact │   total duration │   duration_p90 │ owners          │
┝━━━━┿━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━┿━━━━━━━━━┿━━━━━━━━━━━┿━━━━━━━━┿━━━━━━━━━━━━━━━━┿━━━━━━━━━━┿━━━━━━━━━━━━┿━━━━━━━━━┿━━━━━━━━━━┿━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━━┥
│  0 │ //rs/tests/crypto:ingress_verification_test                                      │      92 │ Fri 2026-02-20 13:18:26 │            12 │      12 │         0 │      0 │           13   │     13   │          0 │     0   │  1:22:48 │         10:34:48 │           6:54 │ consensus       │
│  1 │ //rs/tests/consensus/upgrade:upgrade_downgrade_app_subnet_test_head_nns_colocate │     111 │ Mon 2026-02-23 11:28:23 │            14 │      13 │         0 │      1 │           12.6 │     11.7 │          0 │     0.9 │  5:08:00 │  1 days 16:42:00 │          22:00 │ consensus       │
│  2 │ //rs/tests/networking:network_reliability_test_colocate                          │       9 │ Fri 2026-02-20 12:47:36 │             1 │       1 │         0 │      0 │           11.1 │     11.1 │          0 │     0   │     8:02 │          1:12:18 │           8:02 │ consensus       │
│  3 │ //rs/tests/consensus/subnet_recovery:sr_app_large_with_chain_keys_test_colocate  │       9 │ Thu 2026-02-19 14:51:03 │             1 │       1 │         0 │      0 │           11.1 │     11.1 │          0 │     0   │    46:42 │          7:00:18 │          46:42 │ consensus       │
│  4 │ //rs/tests/message_routing/xnet:xnet_slo_120_subnets_staging_test                │       9 │ Tue 2026-02-17 05:05:00 │             1 │       1 │         0 │      0 │           11.1 │     11.1 │          0 │     0   │    18:43 │          2:48:27 │          18:43 │ team-dsm        │
│  5 │ //rs/tests/nested/nns_recovery:nr_large                                          │       9 │ Thu 2026-02-19 09:26:55 │             1 │       1 │         0 │      0 │           11.1 │     11.1 │          0 │     0   │    38:24 │          5:45:36 │          38:24 │ consensus, node │
│  6 │ //rs/tests/consensus/upgrade:upgrade_downgrade_app_subnet_test_colocate          │     113 │ Mon 2026-02-23 12:38:22 │            11 │       9 │         0 │      2 │            9.7 │      8   │          0 │     1.8 │  4:06:46 │  1 days 18:14:58 │          22:26 │ consensus       │
│  7 │ //rs/tests/dre:guest_os_qualification_colocate                                   │      13 │ Sun 2026-02-22 05:32:51 │             1 │       1 │         0 │      0 │            7.7 │      7.7 │          0 │     0   │  1:30:43 │         19:39:19 │        1:30:43 │ dre             │
│  8 │ //rs/bitcoin/adapter:adapter_integration_test                                    │     298 │ Mon 2026-02-23 12:59:19 │            17 │      17 │         0 │      0 │            5.7 │      5.7 │          0 │     0   │  1:49:22 │  1 days 07:57:08 │           6:26 │ defi            │
│  9 │ //rs/tests/consensus/upgrade:upgrade_app_subnet_test                             │     109 │ Mon 2026-02-23 12:43:02 │             6 │       4 │         0 │      2 │            5.5 │      3.7 │          0 │     1.8 │  1:27:54 │  1 days 02:36:51 │          14:39 │ consensus       │
┕━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━━━━━┷━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┙