[k4lleanka]

Fixes #4781.

When the scanner stopped while the daemon kept the stream open (e.g. a log line over 64KiB), the container and service tails retried without closing the previous ContainerLogs/ServiceLogs stream. Each retry leaked a connection and the daemon's handles on the log files. The stream is now closed when the attempt returns.

Tested:

• TestTailClosesLogStreams (container and service) fails on master (7 and 9 streams left open) and passes with the fix; 50 runs with -race.
• go test -race ./pkg/acquisition/modules/docker/... on Linux, golangci-lint v2.13 for linux, windows and freebsd.
• Against Docker 29.8.1 with a container printing a 70KB line per second: master leaked 20 streams in 40s and dockerd's fds on the container's json log grew from 1 to 18. With the fix, every stream was closed and the fd count stayed at 1.

I read the diff line by line, ran the tests myself, and verified the Docker reproduction.

/kind fix
/area agent