feat: improve parameters usage description

[scolladon]

What does this pull request contain?

---

• Added (for new features).
• Changed (for changes in existing functionality).
• Deprecated (for soon-to-be removed features).
• Removed (for now removed features).
• Fixed (for any bug fixes).
• Security (for vulnerability fixes).

Explain your changes

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Improve Admin experience by changing the name of the inputs, their descriptions and the possible value to put into

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (53985ae) compared to base (6567b7a).
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Additional details and impacted files

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[mehdicherf]

I think I preferred the previous default values.

When I see latest-rc and latest, I assume that it's proposing to promote latest-rc to latest, making it easy for me (as an admin) to understand the meaning of those 2 parameters.

On the other hand, if I see vX.Y.Z and stable | latest | latest-rc | vA.B.C, there is no relationship between those examples that would help me understand in which direction the promotion is supposed to work.

[scolladon]

Issue here is we cannot move an alias to another alias
We need to move an alias to a version number.
This is why I changed the default values, they works as a placeholder here.
We could use a dropdown list for the second one as it cannot be a version number and it is one of those 3 (stable latest or latest-rc)

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