[Security] remove plaintext password hasher usage

[kbond]

I think we shouldn't promote using the plaintext hasher at all.

Context:

• [symfony/security-bundle] set default algorithm to plaintext recipes#1379
• [symfony/security-bundle] use lowest possible p/w hash "work factor" in test env recipes#1026
• [security-bundle recipe] Use less resource-intensive password hasher for test environment recipes#1024

[kbond]

I'm not super confident on these xml/php config changes - please review.

[stof]

should be <srv:when> as this code snippet defines the SecurityBundle XML namespace as the default namespace and uses the srv alias for the XML namespace of the DI component

[stof]

hmm, actually, this XML code snippet is already a mess, as it mixes cases, sometimes using a security alias (not registered on the top-level element) for nodes of the SecurityBundle config

[javiereguiluz]

What should we do here? Can this snippet be fixed easily? Otherwise, we could just remove it. Symfony plans to remove XML config support "soon", so this is not important. Thanks.

[kbond]

I'd vote to remove

[javiereguiluz]

Merged! We merged it in 6.4 and up. We also removed the wrong XML config while merging. Thanks Kevin!