Added extra cli flag webhook-port

[abelperezok]

This PR is related to the following issues:

• Allow using custom ports for metrics, health checks and proxy opentelemetry-helm-charts#214
• Allow using custom port for webhook  #896

It includes a new CLI flag webhook-port to allow the user to select a different port in case the default 9443 is already in use by another cluster add-on.

The second commit fixes a typo in the code that prevented the correct use of the CLI flag health-probe-addr, before the change, you'll get the following error if you attempt to pass the flag.

unknown flag: --health-probe-addr

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: abelperezok / name: Abel Perez Martinez (4fa2405)

[abelperezok]

I had a look at the failed e2e tests logs and it looks like a transient error:

go: github.com/docker/[email protected]: read tcp 172.17.0.2:45116->142.250.136.141:443: read: connection reset by peer
The command '/bin/sh -c go mod download' returned a non-zero code: 1
make: *** [Makefile:181: container-target-allocator] Error 1

Could this be retried ?

Another question: should this change justify a bump in either patch number or minor number version ?

[yuriolisa]

@abelperezok, I just restarted the tests.

[yuriolisa]

Thank you @abelperezok for your PR! LGTM!