[BUGFIX] Add safeguard in case normalizedParams are missing

With #100885 the availability of the normalizedParams request attribute
became a requirement for user sessions initialized with a custom PSR-7
request. Extensions like EXT:container relied on the fact that a plain
request object could be passed to `Bootstrap::initializeBackendUser()`.

This will be fixed in EXT:container[1] but in case other extensions
relied on this as well, a fallback is now provided.

[1] https://github.com/b13/container/pull/461

Resolves: #102520
Related: #100885
Releases: main, 12.4
Change-Id: Idbf5a6b3d72ecab4a9943d7bb2febf41fa4b6635
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81908


Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benjamin Franzke <ben@bnf.dev>