This is causing issues on LUCI workers that were upgraded to a new version of Ubuntu.

See flutter#165594
See flutter#165620

This is causing issues on LUCI workers that were upgraded to a new
version of Ubuntu.

See #165594
See #165620

This is causing issues on LUCI workers that were upgraded to a new
version of Ubuntu.

See flutter#165594
See flutter#165620

With the ubuntu upgrade, everything is leaking now.

This pull request is created by [automatic cherry pick workflow]

### Issue Link:
What is the link to the issue this cherry-pick is addressing?
#166553

CP of 
* #165620
* #165661
* #165675
* #165692 
* #165678
* *Not merged in master* #166559

Test configuration error
https://mail.google.com/chat/u/0/#chat/space/AAAAQFWU2Go/dHeIlEXFg2w/dHeIlEXFg2w

### Changelog Description:
N/A

### Impact Description:
blocking #165430

### Workaround:
none

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

The `Linux tool_integration_tests*` have been failing on this release branch, blocking cherry picks flutter#165430 and flutter#165428. This PR attempts to cherry pick fixes that will make the tests go green.

This PR contains cherry-picks of three PRs:

  * flutter#164935
  * flutter#165620
  * flutter#165661

Example of the failures I was seeing: https://github.com/flutter/flutter/pull/165428/checks?check_run_id=38997055797.

```
error: {
  code: 5
  message: builder not found: "Linux tool_integration_tests_1_6"
}
```

With the ubuntu upgrade, everything is leaking now.

This is causing issues on LUCI workers that were upgraded to a new
version of Ubuntu.

See flutter#165594
See flutter#165620

With the ubuntu upgrade, everything is leaking now.

This is causing issues on LUCI workers that were upgraded to a new
version of Ubuntu.

See flutter#165594
See flutter#165620