feat: added ``persistent`` config item to redis handler `Session`

[ddevsr]

Description Needed #9792

Checklist:

• [x] Securely signed commits
• [ ] Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• [ ] Unit testing, with >80% coverage
• [x] User guide updated
• [x] Conforms to style guide

[neznaika0]

@ddevsr wait for the first PR to be accepted. There is no need to send an additional one in advance. What if your first PR changes? Besides, it's not clear what exactly you're changing in this PR.