Split needless_lifetime '_ suggestions into elidable_lifetime_names

[Alexendoo]

Fixes #13514

changelog: Added [elidable_lifetime_names] to pedantic (Split off from [needless_lifetime] for suggestions with '_)
#13960

changelog: Enhancement: [needless_lifetime] No longer lints for elidable lifetimes '_, use [elidable_lifetime_names] to lint these.
#13960

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[samueltardieu]

I like this lint splitting, I'm just not sure about the category to use for the new lint.

[xFrednet]

LGTM, two documentation nits, but otherwise LGTM :D

(Sorry, for the delay with the review, RL is currently taking more time than before ^^')

And thank you to @samueltardieu for his review! <3

[xFrednet]

LGTM, thank you for addressing my previous comments :D

I've created an FCP

Roses are 'red,
Violets are 'blue,
Those lifetimes are,
needless and elidable,
but still needed,
for the poem flow,

[xFrednet]

The FCP has concluded (Sorry, for not following up on this earlier 🙈 )