test: KAIL_VERSION=v0.16.1 is out of date in e2e-common.sh

## Problem

`test/e2e-common.sh` line 77 pins kail at a version that is several years old:

```bash
readonly KAIL_VERSION=v0.16.1
```

`kail` is actively used in `test_setup()` (line 336) to stream pod logs during e2e tests. The latest release of `boz/kail` is `v0.17.4`.

## Proposed Fix

Update to `KAIL_VERSION=v0.17.4`.