FIX update create_memmap_backed_data to work on any estimator object via joblib 1.2.0 and later

[ogrisel]

Fixes #27613.

Note that on recent versions of joblib (after version 1.2.0) joblib.load(filepath, mmap_model="r") automatically allocates aligned memmap arrays (thanks to @lesteve's work), so there is no need for special casing anymore.

@jeromedockes can you please check that this fixes the problem for you? If so I will complete the PR to clean-up old code, set JOBLIB_MIN_VERSION to 1.2.0 instead of 1.1.1 and document it all in whats new.

EDIT: I simplified the code to always rely on joblib to allocate aligned memory mapped arrays. This made it possible to delete the broken fallback helper functions that did not work as intended in the specific runtime environment of Jerome.

[github-actions]

✔️ Linting Passed

All linting checks passed. Your pull request is in excellent shape! ☀️

_{Generated for commit: e10f003. Link to the linter CI: here}

[jeromedockes]

Thanks! yes I can confirm that this fixes the problem for me

[glemaitre]

LGTM

[glemaitre]

A bit to quick at approving. Apparently it does not work in Windows:

NotADirectoryError: [WinError 267] The directory name is invalid: 'C:\\Users\\VSSADM~1\\AppData\\Local\\Temp\\sklearn_test_pickle__f2x5od6\\estimator.pkl'

but it might be more linked to the following:

PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\VSSADM~1\\AppData\\Local\\Temp\\sklearn_test_pickle__f2x5od6\\estimator.pkl'

[ogrisel]

@glemaitre this should be all-green now. Feel free to re-review.

[glemaitre]

LGTM. Thanks @ogrisel