fix terraform scripts

[m-ildefons]

1. Silence output of wget to make logs more readable.
2. Force unzip to never prompt when extracting files.
   This can break CI pipelines because there the prompt will never be
   answered.

[lanfon72]

LGTM

CI will never hit the prompt issue because we will download terraform to different folder as fixtures below:

tests/harvester_e2e_tests/fixtures/terraform.py

Lines 191 to 205 in 4059bc6

	def tf_executor(tf_script_dir):
	run(str(tf_script_dir / "terraform_install.sh"), stdout=PIPE, stderr=PIPE)
	executor = tf_script_dir / "bin/terraform"
	assert executor.is_file()
	yield executor
	@pytest.fixture(scope="session")
	def tf_harvester(api_client, tf_script_dir, tf_provider_version, tf_executor):
	harv = TerraformHarvester(tf_executor, tf_script_dir / datetime.now().strftime("%Hh%Mm_%m-%d"))
	kuebconfig = api_client.generate_kubeconfig()
	out, err, exc_code = harv.initial_provider(kuebconfig, tf_provider_version)
	assert not err and 0 == exc_code
	return harv

The prompt problem will happen only when executing the script independently.