[Security] Add a method in the security helper to ease programmatic login

[chalasr]

Q	A
Feature PR	symfony/symfony#41274
PR author(s)	@johnkrovitch, @chalasr
Merged in	6.2

[javiereguiluz]

Closing as a duplicate of #17016.

[xabbuh]

reopening here as #17016 is about logging users out

[wouterj]

Hi @johnkrovitch! Thanks for contributing this feature (I'm happy it's finally merged).

Do you have time (and are you willing) to write a short section about this new helper to login users? I think this is best as a new subsection at the end Authenticating Users.

[johnkrovitch]

Hi @wouterj ,

yes, I try to do that this evening.

[johnkrovitch]

The documentation has been added in #17284