[21158] CI - Improve CI inputs

[JesusPoderoso]

Description

This PR performs the following improvements in this project CI:

• Set build and test conditions as reusable workflow inputs, so 'if's and labels are only considered in the pull request workflow, making reusable-workflows pull request event agnostic

This PR is on top of (and must be merged before):

• 4971

  Important: Backports must remove nightly workflows

  @Mergifyio backport 2.14.x 2.13.x 2.10.x 2.6.x

Contributor Checklist

• [x] Commit messages follow the project guidelines.
• N/A The code follows the style guidelines of this project.
• N/A Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A Any new/modified methods have been properly documented using Doxygen.
• N/A Any new configuration API has an equivalent XML API (with the corresponding XSD extension)
• N/A Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• N/A Changes are API compatible.
• N/A New feature has been added to the versions.md file (if applicable).
• N/A New feature has been documented/Current behavior is correctly described in the documentation.
• [x] Applicable backports have been included in the description.

Reviewer Checklist

• [x] The PR has a milestone assigned.
• [ ] The title and description correctly express the PR's purpose.
• [ ] Check contributor checklist is correct.
• [ ] Check CI results: changes do not issue any warning.
• [ ] Check CI results: failing tests are unrelated with the changes.