fix: li missing platform name

[BENR0]

This fixes the DataArrays returned by the li reader missing the platform_name attribute.

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.08%. Comparing base (fd2cec6) to head (bc6ddbb).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2993      +/-   ##
==========================================
- Coverage   96.10%   96.08%   -0.02%     
==========================================
  Files         377      377              
  Lines       55147    55155       +8     
==========================================
  Hits        52997    52997              
- Misses       2150     2158       +8     

Flag	Coverage Δ
behaviourtests	3.94% <ø> (-0.01%)	⬇️
unittests	96.18% <ø> (-0.02%)	⬇️

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[coveralls]

Pull Request Test Coverage Report for Build 11951131663

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.193%

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Totals
Change from base Build 11936881763:	0.0%
Covered Lines:	53241
Relevant Lines:	55348

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💛 - Coveralls

[ameraner]

Thanks @BENR0 , I've noticed this as well recently. Could we take the platform info from the filename and use the mapping as done for FCI here?

satpy/satpy/readers/fci_l1c_nc.py

Lines 205 to 209 in 1a7a342

	_platform_name_translate = {
	"MTI1": "MTG-I1",
	"MTI2": "MTG-I2",
	"MTI3": "MTG-I3",
	"MTI4": "MTG-I4"}

Although the question of the platform name and the operational renaming to e.g. MET-12 is very valid...

[BENR0]

@ameraner Maybe we just wait till it is renamed to fix it? Shouldn't be that long till then I guess? ;-)
And yes I think a mapping would make it more future proof.

[ameraner]

Yeah, should only be a couple of weeks or so :) As you prefer, I'm ok also with merging this and update again later.
Then I would use a mapping/naming similar to what is used for SEVIRI, like Meteosat-XX

satpy/satpy/readers/seviri_l1b_native.py

Line 317 in d22d2b6

self.mda["platform_name"] = "Meteosat-" + SATNUM[self.platform_id]