Add new CI variable for releases

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What does this MR do and why?

Adds CI variable CI_RELEASE_NAME.

Related to !98447 (merged) where the variable CI_RELEASE_DESCRIPTION has been created.

The release name cannot be empty, whilst the description can. This creates an easy way to make a pipeline trigger only on a release.

How to set up and validate locally

1. Use the following simple CI configuration to a test project in local and create a release and run pipeline for the corresponding release tag.

image: alpine:latest

stages:
  - test

prod:
  stage: test
  script:
    - echo "Release name is $CI_RELEASE_NAME"

1. The job logs should include the variable message being printed when echoed.

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