Add checksum input and update the upload files to S3 steps

[Enaraque]

Description

The goal of this PR is to add the mandatory checksum field to the workflow for building the installation assistant packages.

With this, a new step has been added to generate the sha512 files and another step to upload them to S3.

Additionally, an echo with the URI of each file uploaded to S3 has been added to better identify it.

[!NOTE] This step implies that we have to upload the installation assistant files one by one to correctly obtain the URI of each file.

Workflow output test

• https://github.com/wazuh/wazuh-installation-assistant/actions/runs/11295854932

Related issue

• 105