chore!: Remove wget from Promtail docker image (#15101)

The package has been added to the Docker image with PR #11711 with the intention to support the Docker healthcheck.

However, to reduce the attack surface of our Docker images, we want to keep them as slim as possible. The current version of Promtail (3.3.0) for example contains a wget version with vulnerability [CVE-2024-38428](https://security-tracker.debian.org/tracker/CVE-2024-38428).

The healthcheck can be achieved by other means, e.g.

1. Extend the `grafana/promtail` base image and add `wget` using `apt install wget`
   #11590 (comment)
3. Use low-level `/dev/tcp/127.0.0.1:9080` to establish a connection and check the exit code
   #11590 (comment)

Original discussion about adding wget #11590
This may break someone's Docker compose installation, when they require on the `wget` powered health check.


Signed-off-by: Christian Haudum <christian.haudum@gmail.com>

clients/cmd/promtail/Dockerfile

@@ -10,7 +10,7 @@ RUN make clean && make BUILD_IN_CONTAINER=false PROMTAIL_JOURNAL_ENABLED=true pr
 FROM debian:12.8-slim
 # tzdata required for the timestamp stage to work
 RUN apt-get update && \
-  apt-get install -qy tzdata ca-certificates wget libsystemd-dev && \
+  apt-get install -qy tzdata ca-certificates libsystemd-dev && \
   rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 COPY --from=build /src/loki/clients/cmd/promtail/promtail /usr/bin/promtail
 COPY clients/cmd/promtail/promtail-docker-config.yaml /etc/promtail/config.yml