Automated template mirrorlist produces incorrect links

[Spartan322]

Issue description: The template mirrorlist behavior performed by Redot expects https://www.redotengine.org/api/mirrorlists/4.3.rc.2.json to produce https://github.com/Redot-Engine/redot-engine/releases/download/redot-4.3-rc.2/Redot_v4.3-rc.2_export_templates.tpz as the url however it produces https://github.com/Redot-Engine/redot-engine/releases/download/redot-4.3.rc.2/Redot_v4.3.rc.2_export_templates.tpz, notice there is a difference between redot-4.3-rc.2 and redot-4.3.rc.2, Redot releases are in the former style but engine itself points to a link in the latter style. The mirrorlist behavior will need to check for the first occurrence of <number>.<alpha> and replace it with <number>-<alpha>.

URL to the web page: https://www.redotengine.org/api/mirrorlists/4.3.rc.2.json

[opdev1004]

If we following former versioning rules, name of json file should be 4.3-rc.2.json as well. Is there any valid reason keeping json file name like 4.3.rc.2.json when it actually should be 4.3-rc.2.json?

https://www.redotengine.org/api/mirrorlists/4.3-rc.2.json

Because it is better to make them same format, instead of using this here and using that there.

mono as well. why do .mono.json? they all need to follow former versioning format, not this here then that there

Do https://www.redotengine.org/api/mirrorlists/4.3-rc.2_mono.json instead of https://www.redotengine.org/api/mirrorlists/4.3.rc.2.mono.json

This seems invalid. Expecially when they are based on versioning.

[opdev1004]

This time, we had enough conversation about this in discord.

The godot engine is really poorly designed. So it's quicker to resolve this issue from web side.

Maybe in the future, if there's a dev who brave and strong enough, he/she/they can change the engine to be better system design.

I will add information about this in the repo.

[opdev1004]

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