Hackday deprecated 12621
minor #12699 Hackday deprecated 12621 (arnaugm)

This PR was squashed before being merged into the 2.7 branch (closes #12699).

Discussion
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Hackday deprecated 12621

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12621
| License       | MIT
| Doc PR        | -

[MonologBridge] added the deprecated error trigger in the monolog logger emerg(), crit(), err() and warn() methods
[HttpKernel] added the deprecated error trigger in the NullLogger emerg(), crit(), err() and warn() methods

Commits
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88b9500 Hackday deprecated 12621