feat: delete the host after host leave peers during host manager gc

[BruceAko]

Description

During host manager RunGC(), reclaim the host directly after host leave peers, as host's ConcurrentUploadCount may not be 0 when the host exits abnormally.

Related Issue

3350

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation Update (if none of the other choices apply)

Checklist

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 52.72%. Comparing base (8153e57) to head (2ed4d07).

Additional details and impacted files

[](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3361?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) ```diff @@ Coverage Diff @@ ## main #3361 +/- ## ========================================== + Coverage 52.68% 52.72% +0.03% ========================================== Files 192 192 Lines 20408 20410 +2 ========================================== + Hits 10752 10761 +9 + Misses 8854 8848 -6 + Partials 802 801 -1 ``` | [Flag](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3361/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3361/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) | `52.72% <100.00%> (+0.03%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3361?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) | Coverage Δ | | |---|---|---| | [scheduler/resource/host\_manager.go](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3361?src=pr&el=tree&filepath=scheduler%2Fresource%2Fhost_manager.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss#diff-c2NoZWR1bGVyL3Jlc291cmNlL2hvc3RfbWFuYWdlci5nbw==) | `86.66% <100.00%> (+0.45%)` | :arrow_up: | ... and [5 files with indirect coverage changes](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3361/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss)